matter

mat·ter

M0155100 (măt′ər)n.1. That which occupies space and has mass; physical substance.2. A type of such substance: organic matter.3. Discharge or waste, such as pus or feces, from a living organism.4. Philosophy In Aristotelian and Scholastic use, that which is in itself undifferentiated and formless and which, as the subject of change and development, receives form and becomes substance.5. The substance of thought or expression as opposed to the manner in which it is stated or conveyed.6. A subject of concern, feeling, or action: matters of foreign policy; a personal matter. See Synonyms at subject.7. Trouble or difficulty: What's the matter with your car?8. An approximated quantity, amount, or extent: The construction will last a matter of years.9. Something printed or otherwise set down in writing: reading matter.intr.v. mat·tered, mat·ter·ing, mat·ters To be of importance: "Love is most nearly itself / When here and now cease to matter" (T.S. Eliot).Idioms: as a matter of fact In fact; actually. for that matter So far as that is concerned; as for that. no matter Regardless of: "Yet there isn't a train I wouldn't take, / No matter where it's going" (Edna St. Vincent Millay).

[Middle English mater, from Old French matere, from Latin māteria, wood, timber, matter, from māter, mother (because the woody part was seen as the source of growth); see māter- in Indo-European roots.]

matter

(ˈmætə) n1. that which makes up something, esp a physical object; material2. substance that occupies space and has mass, as distinguished from substance that is mental, spiritual, etc3. substance of a specified type: vegetable matter; reading matter. 4. (sometimes foll by: of or for) thing; affair; concern; question: a matter of taste; several matters to attend to; no laughing matter. 5. a quantity or amount: a matter of a few pence. 6. the content of written or verbal material as distinct from its style or form7. (used with a negative) importance; consequence8. (Philosophy) philosophy (in the writings of Aristotle and the Scholastics) that which is itself formless but can receive form and become substance9. (Philosophy) philosophy (in the Cartesian tradition) one of two basic modes of existence, the other being mind: matter being extended in space as well as time10. (Printing, Lithography & Bookbinding) printing a. type set up, either standing or for useb. copy to be set in type11. (Pathology) a secretion or discharge, such as pus12. (Law) law a. something to be provedb. statements or allegations to be considered by a court13. for that matter as regards that14. See grey matter15. no matter a. regardless of; irrespective of: no matter what the excuse, you must not be late. b. (sentence substitute) it is unimportant16. the matter wrong; the trouble: there's nothing the matter. vb (intr) 17. to be of consequence or importance18. (Pathology) to form and discharge pus[C13 (n), C16 (vb): from Latin māteria cause, substance, esp wood, or a substance that produces something else; related to māter mother]

mat•ter

(ˈmæt ər)

n. 1. the substance of which any physical object consists or is composed. 2. physical or corporeal substance in general, whether solid, liquid, or gaseous, esp. as distinguished from incorporeal substance, as spirit or mind, or from qualities, actions, and the like. 3. something that occupies space. 4. a particular kind of substance: coloring matter. 5. a situation; affair: a trivial matter. 6. an amount or extent reckoned approximately: a matter of 10 miles. 7. importance; significance: decisions of little matter. 8. reason; cause: a matter for complaint. 9. the substance of discourse or writing. 10. something written or printed: reading matter. 11. things sent by mail. 12. a substance discharged by a living body, esp. pus. 13. that which relates to form as potentiality does to actuality. v.i. 14. to be of importance; signify: It matters to me. 15. to suppurate. Idioms: 1. for that matter, as far as that is concerned; as for that. 2. no matter, regardless or irrespective of: no matter how we try. 16. to be the matter, to be a source of concern; be amiss or awry: What's the matter? Something's the matter. [1175–1225; Middle English mater(e), materie < Anglo-French, Old French mat(i)ere, materie < Latin māteria woody part of a tree, material, substance, derivative of māter mother¹] mat′ter•ful, adj. mat′ter•less, adj. syn: matter, material, stuff, substance refer to that of which physical objects are composed. matter applies to anything occupying space and perceptible to the senses; it may denote a particular kind: solid matter; vegetable matter. material refers to a definite kind of matter, esp. that used to manufacture or construct something: woolen material; building materials. stuff is an informal term that applies to the basic material of which something is made; it may also denote an unspecified kind of material: Do you have the stuff to make the rug? substance is usu. a definite kind of matter thought of in relation to its characteristic properties: a sticky substance. These terms are also used abstractly, esp. with reference to thought or expression: controversial matter; material for a novel; the stuff of dreams; the substance of a speech.

mat·ter

(măt′ər) Something that occupies space, has mass, and can exist ordinarily as a solid, liquid, or gas.

Matter

See also materials, properties of;physics.
allomorphismvariant crystalline structure in a chemical compound. — allomorphic, adj.allotropism, allotropythe quality of certain substances to exist in more than one form, with different properties in each form. — allotropic, allotropical, adj.hylozoismPhilosophy. the doctrine that all matter has life. — hylozoist, n. — hylozoistic, adj.materialism1. the philosophical theory that regards matter and its phenomena as the only reality and explains all occurrences, including the mental, as due to material agencies.
2. attention to or emphasis on material objects, needs, and considerations, with a disinterest in or rejection of intellectual and spiritual values. — materialist, n. — materialistic, adj.monismMetaphysics. any of various theories holding that there is only one basic substance or principle that is the ground of reality. — monist, n. — monistic, monistical, adj.rheologyChemistry and Geology. the study of the flow and deformation of colloids, especially pastes. — rheologist, n. — rheologic, rheological, adj.somatologyObsolete, the branch of physics that studies the properties of matter. Also called somatics.

matter

1. talking about a problem

The matter is used after what, something, anything, or nothing to talk about a problem or difficulty. You use the matter in the same way as an adjective like wrong. For example, instead of saying 'Is something wrong?' you can say 'Is something the matter?'

What's the matter?There's something the matter with your eyes.

Be Careful!
Don't use 'the matter' with this meaning in other types of sentence. Don't say, for example, 'The matter is that we don't know where she is'. Say 'The problem is that we don't know where she is' or 'The trouble is that we don't know where she is'.

The problem is that she can't cook.The trouble is there isn't enough money.2. 'It doesn't matter'

When someone apologizes to you, you can say 'It doesn't matter.' Don't say 'No matter'.

'I've only got dried milk.' 'It doesn't matter.'3. 'no matter'

You use no matter in expressions such as no matter what and no matter how to say that something happens or is true in all circumstances.

He does what he wants, no matter what I say.Call me when you get home, no matter how late it is.

Don't use no matter to mention something that makes your main statement seem surprising. Don't say, for example, 'No matter the rain, we carried on playing'. Say 'In spite of the rain, we carried on playing' or 'Despite the rain, we carried on playing'

In spite of his ill health, my father was always cheerful.See in spite of - despite4. used as a countable noun

A matter is a situation that someone has to deal with.

I wanted to talk to you about a personal matter.This is a matter for the police.

You can use the plural form matters to refer to a situation that has just been discussed.

There is only one applicant for the job, which makes matters easier.His attitude did not help matters.

Be Careful!
When matters has this meaning, don't put 'the' in front of it. Don't say, for example 'His attitude did not help the matters.'

matter

Past participle: mattered
Gerund: mattering

Imperative
matter
matter

Present
I matter
you matter
he/she/it matters
we matter
you matter
they matter

Preterite
I mattered
you mattered
he/she/it mattered
we mattered
you mattered
they mattered

Present Continuous
I am mattering
you are mattering
he/she/it is mattering
we are mattering
you are mattering
they are mattering

Present Perfect
I have mattered
you have mattered
he/she/it has mattered
we have mattered
you have mattered
they have mattered

Past Continuous
I was mattering
you were mattering
he/she/it was mattering
we were mattering
you were mattering
they were mattering

Past Perfect
I had mattered
you had mattered
he/she/it had mattered
we had mattered
you had mattered
they had mattered

Future
I will matter
you will matter
he/she/it will matter
we will matter
you will matter
they will matter

Future Perfect
I will have mattered
you will have mattered
he/she/it will have mattered
we will have mattered
you will have mattered
they will have mattered

Future Continuous
I will be mattering
you will be mattering
he/she/it will be mattering
we will be mattering
you will be mattering
they will be mattering

Present Perfect Continuous
I have been mattering
you have been mattering
he/she/it has been mattering
we have been mattering
you have been mattering
they have been mattering

Future Perfect Continuous
I will have been mattering
you will have been mattering
he/she/it will have been mattering
we will have been mattering
you will have been mattering
they will have been mattering

Past Perfect Continuous
I had been mattering
you had been mattering
he/she/it had been mattering
we had been mattering
you had been mattering
they had been mattering

Conditional
I would matter
you would matter
he/she/it would matter
we would matter
you would matter
they would matter

Past Conditional
I would have mattered
you would have mattered
he/she/it would have mattered
we would have mattered
you would have mattered
they would have mattered

matter

The physical being.

Thesaurus

Noun	1.	matter - a vaguely specified concern; "several matters to attend to"; "it is none of your affair"; "things are going well"affair, thingconcern - something that interests you because it is important or affects you; "the safety of the ship is the captain's concern"least - something that is of no importance; "it is the least I can do"; "that is the least of my concerns"
	2.	matter - some situation or event that is thought about; "he kept drifting off the topic"; "he had been thinking about the subject for several years"; "it is a matter for the police"topic, issue, subjectcognitive content, mental object, content - the sum or range of what has been perceived, discovered, or learnedarea - a subject of study; "it was his area of specialization"; "areas of interest include..."blind spot - a subject about which you are ignorant or prejudiced and fail to exercise good judgment; "golf is one of his blind spots and he's proud of it"remit - the topic that a person, committee, or piece of research is expected to deal with or has authority to deal with; "they set up a group with a remit to suggest ways for strengthening family life"res adjudicata, res judicata - a matter already settled in court; cannot be raised again
	3.	matter - that which has mass and occupies space; "physicists study both the nature of matter and the forces which govern it"physical entity - an entity that has physical existencesubstance - the real physical matter of which a person or thing consists; "DNA is the substance of our genes"substance - a particular kind or species of matter with uniform properties; "shigella is one of the most toxic substances known to man"sediment, deposit - matter that has been deposited by some natural processylem - (cosmology) the original matter that (according to the big bang theory) existed before the formation of the chemical elementsdark matter - (cosmology) a hypothetical form of matter that is believed to make up 90 percent of the universe; it is invisible (does not absorb or emit light) and does not collide with atomic particles but exerts gravitational forceantimatter - matter consisting of elementary particles that are the antiparticles of those making up normal substancesglop - any gummy shapeless matter; usually unpleasantfluid - continuous amorphous matter that tends to flow and to conform to the outline of its container: a liquid or a gasgoo, gook, goop, guck, gunk, muck, ooze, slime, sludge - any thick, viscous mattersystem - (physical chemistry) a sample of matter in which substances in different phases are in equilibrium; "in a static system oil cannot be replaced by water on a surface"; "a system generating hydrogen peroxide"residue - matter that remains after something has been removedsolid - matter that is solid at room temperature and pressuresolute - the dissolved matter in a solution; the component of a solution that changes its stateemanation - something that is emitted or radiated (as a gas or an odor or a light, etc.)vegetable matter - matter produced by plants or growing in the manner of a plant
	4.	matter - a problem; "is anything the matter?"trouble, problem - a source of difficulty; "one trouble after another delayed the job"; "what's the problem?"
	5.	matter - (used with negation) having consequence; "they were friends and it was no matter who won the games"consequence, moment, import - having important effects or influence; "decisions of great consequence are made by the president himself"; "virtue is of more moment than security"; "that result is of no consequence"
	6.	matter - written works (especially in books or magazines); "he always took some reading matter with him on the plane"piece of writing, written material, writing - the work of a writer; anything expressed in letters of the alphabet (especially when considered from the point of view of style and effect); "the writing in her novels is excellent"; "that editorial was a fine piece of writing"dictation - matter that has been dictated and transcribed; a dictated passage; "he signed and mailed his dictation without bothering to read it"text, textual matter - the words of something written; "there were more than a thousand words of text"; "they handed out the printed text of the mayor's speech"; "he wants to reconstruct the original text"text - the main body of a written work (as distinct from illustrations or footnotes etc.); "pictures made the text easier to understand"typescript - typewritten matter especially a typewritten copy of a manuscriptfront matter, prelims - written matter preceding the main text of a bookback matter, end matter - written matter following the main text of a booksoft copy - (computer science) matter that is in a form that a computer can store or display it on a computer screen; "he sent them soft copy of the report"hard copy - (computer science) matter that is held in a computer and is typed or printed on paper; "he ran off a hard copy of the report"addendum, supplement, postscript - textual matter that is added onto a publication; usually at the endrecitation - written matter that is recited from memory
Verb	1.	matter - have weight; have import, carry weight; "It does not matter much"count, weighbe - have the quality of being; (copula, used with an adjective or a predicate noun); "John is rich"; "This is not a good answer"press, weigh - to be oppressive or burdensome; "weigh heavily on the mind", "Something pressed on his mind"matter to, interest - be of importance or consequence; "This matters to me!"

matter

noun1. situation, thing, issue, concern, business, question, event, subject, affair, incident, proceeding, episode, topic, transaction, occurrence It was a private matter.2. substance, material, body, stuff A proton is an elementary particle of matter.3. content, sense, subject, argument, text, substance, burden, thesis, purport, gist, pith This conflict forms the matter of the play.4. (Medical) pus, discharge, secretion, suppuration, purulence If the wound starts to produce yellow matter, see your doctor.5. importance, interest, moment, note, weight, import, consequence, significance Forget it; it's of no matter.6. problem, worry, trouble, difficulty, upset, bother, distress, complication, uphill (S. African) What's the matter?verb1. be important, make a difference, count, be relevant, make any difference, mean anything, have influence, carry weight, cut any ice (informal), be of consequence, be of account It doesn't matter how long you take.as a matter of fact actually, in fact, in reality, in truth, as it happens, believe it or not, to tell the truth, in actual fact, in point of fact As as matter of fact, you may be wrong.no matter don't worry about it, never mind, it doesn't matter, don't apologise, it makes no difference or odds 'I forgot to bring it.' 'No matter.'Quotations
"What is matter? - Never mind."
"What is mind? - No matter" Punch

matter

noun1. That which occupies space and can be perceived by the senses:materiality, substance.2. That from which things are or can be made:material, stuff, substance.Idiom: grist for one's mill.3. What a speech, piece of writing, or artistic work is about:argument, point, subject, subject matter, text, theme, topic.4. Something to be done, considered, or dealt with:affair, business, thing.verbTo be of significance or importance:count, import, signify, weigh.

Translations

有关系物质脓要紧课题

matter

(ˈmӕtə) noun1. solids, liquids and/or gases in any form, from which everything physical is made. The entire universe is made up of different kinds of matter.物质2. a subject or topic (of discussion etc). a private matter; money matters. 事情，题材，课题 3. pus. The wound was infected and full of matter.脓 verb to be important. That car matters a great deal to him; It doesn't matter. 有关系，要紧 ˌmatter-of-ˈfact adjective keeping to the actual facts; not fanciful, emotional or imaginative. a matter-of-fact account/statement/opinion/attitude. 就事论事的，讲求实际的 be the matter (often with with) to be the/a trouble, difficulty or thing that is wrong. Is anything the matter?; What's the matter with you?出问题a matter of course something that one expects to happen, be done etc. You don't have to ask her – she'll do it as a matter of course. 理所当然之事，必然的结果 a matter of opinion something about which different people have different opinions or views. Whether she's clever or not is a matter of opinion.看法不同的问题no matter it is not important. `He's not here.' `No matter, I'll see him later.'没关系no matter who/what/where etc whoever, whatever, wherever etc. No matter what happens, I'll go. 不管谁/什么/何地等

matter

→ 事件zhCN, 有关系zhCN

It doesn't matter → 没关系
What's the matter? → 哪儿不舒服？
Can you explain what the matter is? → 能告诉我是什么病吗？

matter

matter,

anything that has massmass,
in physics, the quantity of matter in a body regardless of its volume or of any forces acting on it. The term should not be confused with weight, which is the measure of the force of gravity (see gravitation) acting on a body.
..... Click the link for more information. and occupies space. Matter is sometimes called koinomatter (Gr. koinos=common) to distinguish it from antimatter, or matter composed of antiparticlesantiparticle,
elementary particle corresponding to an ordinary particle such as the proton, neutron, or electron, but having the opposite electrical charge and magnetic moment.
..... Click the link for more information. .

The Properties of Matter

The general properties of matter result from its relationship with mass and space. Because of its mass, all matter has inertiainertia
, in physics, the resistance of a body to any alteration in its state of motion, i.e., the resistance of a body at rest to being set in motion or of a body in motion to any change of speed or change in direction of motion. Inertia is a property common to all matter.
..... Click the link for more information. (the mass being the measure of its inertia) and weightweight,
measure of the force of gravity on a body (see gravitation). Since the weights of different bodies at the same location are proportional to their masses, weight is often used as a measure of mass.
..... Click the link for more information. , if it is in a gravitational field (see gravitationgravitation,
the attractive force existing between any two particles of matter. The Law of Universal Gravitation

Since the gravitational force is experienced by all matter in the universe, from the largest galaxies down to the smallest particles, it is often called
..... Click the link for more information. ). Because it occupies space, all matter has volume and impenetrability, since two objects cannot occupy the same space simultaneously.

The special properties of matter, on the other hand, depend on internal structure and thus differ from one form of matter, i.e., one substance, to another. Such properties include ductilityductility,
ability of a metal to plastically deform without breaking or fracturing, with the cohesion between the molecules remaining sufficient to hold them together (see adhesion and cohesion). Ductility is important in wire drawing and sheet stamping.
..... Click the link for more information. , elasticityelasticity,
the ability of a body to resist a distorting influence or stress and to return to its original size and shape when the stress is removed. All solids are elastic for small enough deformations or strains, but if the stress exceeds a certain amount known as the elastic
..... Click the link for more information. , hardnesshardness,
property of matter commonly described as the resistance of a substance to being scratched by another substance. The degree of hardness is relative, different substances being compared with one another.
..... Click the link for more information. , malleabilitymalleability,
property of a metal describing the ease with which it can be hammered, forged, pressed, or rolled into thin sheets. Metals vary in this respect; pure gold is the most malleable. Silver, copper, aluminum, lead, tin, zinc, and iron are also very malleable.
..... Click the link for more information. , porosity (ability to permit another substance to flow through it), and tenacity (resistance to being pulled apart).

The States of Matter

Matter is ordinarily observed in three different states, or phases (see states of matterstates of matter,
forms of matter differing in several properties because of differences in the motions and forces of the molecules (or atoms, ions, or elementary particles) of which they are composed.
..... Click the link for more information. ), although scientists distinguish three additional states. Matter in the solid state has both a definite volume and a definite shape; matter in the liquid state has a definite volume but no definite shape, assuming the shape of whatever container it is placed in; matter in the gaseous state has neither a definite volume nor a definite shape and expands to fill any container. The properties of a plasmaplasma,
in physics, fully ionized gas of low density, containing approximately equal numbers of positive and negative ions (see electron and ion). It is electrically conductive and is affected by magnetic fields.
..... Click the link for more information. , or extremely hot, ionized gas, are sufficiently different from those of a gas at ordinary temperatures for scientists to consider them to be the fourth state of matter. So too are the properties of the Bose-Einstein and fermionic condensatescondensate,
matter in the form of a gas of atoms, molecules, or elementary particles that have been so chilled that their motion is virtually halted and as a consequence they lose their separate identities and merge into a single entity.
..... Click the link for more information. , which exist only at temperatures approximating absolute zero (−273.15&degC;), and they are considered the fifth and sixth states of matter respectively.

Early Theories of Matter

In ancient times various theories were suggested about the nature of matter. Empedocles held that all matter is made up of four "elements"—earth, air, fire, and water. Leucippus and his pupil Democritus proposed an atomic basis of matter, believing that all matter is built up from tiny particles differing in size and shape. Anaxagoras, however, rejected any theory in which matter is viewed as composed of smaller constituents, whether atoms or elements, and held instead that matter is continuous throughout, being entirely of a single substance.

Modern Theory of Matter

The modern theory of matter dates from the work of John Dalton at the beginning of the 19th cent. The atomatom
[Gr.,=uncuttable (indivisible)], basic unit of matter; more properly, the smallest unit of a chemical element having the properties of that element. Structure of the Atom
..... Click the link for more information. is considered the basic unit of any element, and atoms may combine chemically to form molecules, the moleculemolecule
[New Lat.,=little mass], smallest particle of a compound that has all the chemical properties of that compound. A single atom is usually not referred to as a molecule, and ionic compounds such as common salt are not made up of molecules.
..... Click the link for more information. being the smallest unit of any substance that possesses the properties of that substance. An elementelement,
in chemistry, a substance that cannot be decomposed into simpler substances by chemical means. A substance such as a compound can be decomposed into its constituent elements by means of a chemical reaction, but no further simplification can be achieved.
..... Click the link for more information. in modern theory is any substance all of whose atoms are the same (i.e., have the same atomic numberatomic number,
often represented by the symbol Z, the number of protons in the nucleus of an atom, as well as the number of electrons in the neutral atom. Atoms with the same atomic number make up a chemical element. Atomic numbers were first assigned to the elements c.
..... Click the link for more information. ), while a compound is composed of different types of atoms together in molecules.

Physical and Chemical Changes

The difference between a mixture and a compound helps to illustrate the difference between a physical change and a chemical change. Different atoms may also be present together in a mixture, but in a mixture they are not bound together chemically as they are in a compound. In a physical change, such as a change of state (e.g., from solid to liquid), the substance as a whole changes, but its underlying structure remains the same; water is still composed of molecules containing two hydrogen atoms and one oxygen atom whether it is in the form of ice, liquid water, or steam. In a chemical change, however, the substance participates in a chemical reactionchemical reaction,
process by which one or more substances may be transformed into one or more new substances. Energy is released or is absorbed, but no loss in total molecular weight occurs.
..... Click the link for more information. , with a consequent reordering of its atoms. As a result, it becomes a different substance with a different set of properties.

Many of the physical properties and much of the behavior of matter can be understood without detailed assumptions about the structure of atoms and molecules. For example, the kinetic-molecular theory of gaseskinetic-molecular theory of gases,
physical theory that explains the behavior of gases on the basis of the following assumptions: (1) Any gas is composed of a very large number of very tiny particles called molecules; (2) The molecules are very far apart compared to their sizes,
..... Click the link for more information. provides a good explanation of the nature of temperaturetemperature,
measure of the relative warmth or coolness of an object. Temperature is measured by means of a thermometer or other instrument having a scale calibrated in units called degrees. The size of a degree depends on the particular temperature scale being used.
..... Click the link for more information. and the basis of the various gas lawsgas laws,
physical laws describing the behavior of a gas under various conditions of pressure, volume, and temperature. Experimental results indicate that all real gases behave in approximately the same manner, having their volume reduced by about the same proportion of the
..... Click the link for more information. and also gives insight into the different states of matter. Substances in different states vary in the strength of the forces between their molecules, with intermolecular forces being strongest in solids and weakest in gases. The force holding like molecules together is called cohesion, while that between unlike molecules is called adhesion (see adhesion and cohesionadhesion and cohesion,
attractive forces between material bodies. A distinction is usually made between an adhesive force, which acts to hold two separate bodies together (or to stick one body to another) and a cohesive force, which acts to hold together the like or unlike
..... Click the link for more information. ). Among the phenomena resulting from intermolecular forces are surface tensionsurface tension,
tendency of liquids to reduce their exposed surface to the smallest possible area. A drop of water, for example, tends to assume the shape of a sphere. The phenomenon is attributed to cohesion, the attractive forces acting between the molecules of the liquid
..... Click the link for more information. and capillaritycapillarity
or capillary action,
phenomenon in which the surface of a liquid is observed to be elevated or depressed where it comes into contact with a solid. For example, the surface of water in a clean drinking glass is seen to be slightly higher at the edges, where
..... Click the link for more information. . An even larger number of aspects of matter can be understood when the nature and structure of the atom are taken into account. The quantum theoryquantum theory,
modern physical theory concerned with the emission and absorption of energy by matter and with the motion of material particles; the quantum theory and the theory of relativity together form the theoretical basis of modern physics.
..... Click the link for more information. has provided the key to understanding the atom, and most basic problems relating to the atom have been solved.

The Relationship of Matter and Energy

The atomic theory of matter does not answer the question of the basic nature of matter. It is now known that matter and energy are intimately related. According to the law of mass-energy equivalence, developed by Albert Einstein as part of his theory of relativityrelativity,
physical theory, introduced by Albert Einstein, that discards the concept of absolute motion and instead treats only relative motion between two systems or frames of reference.
..... Click the link for more information. , a quantity of matter of mass m possesses an intrinsic rest mass energy E given by E = mc², where c is the speed of light. This equivalence is dramatically demonstrated in the phenomena of nuclear fission and fusion (see nuclear energynuclear energy,
the energy stored in the nucleus of an atom and released through fission, fusion, or radioactivity. In these processes a small amount of mass is converted to energy according to the relationship E = mc², where E is energy, m
..... Click the link for more information. ; nucleusnucleus,
in physics, the extremely dense central core of an atom. The Nature of the Nucleus
Composition

Atomic nuclei are composed of two types of particles, protons and neutrons, which are collectively known as nucleons.
..... Click the link for more information. ), in which a small amount of matter is converted to a rather large amount of energy. The converse reaction, the conversion of energy to matter, has been observed frequently in the creation of many new elementary particleselementary particles,
the most basic physical constituents of the universe. Basic Constituents of Matter

Molecules are built up from the atom, which is the basic unit of any chemical element. The atom in turn is made from the proton, neutron, and electron.
..... Click the link for more information. . The study of elementary particles has not solved the question of the nature of matter but only shifted it to a smaller scale.

Bibliography

See V. H. Booth, Elements of Physical Science: The Nature of Matter and Energy (1970); G. Amaldi, The Nature of Matter: Physical Theory from Thales to Fermi (1982).

Matter (physics)

A term that traditionally refers to the substance of which all bodies consist. Matter in classical mechanics is closely identified with mass. Modern analyses distinguish two types of mass: inertial mass, by which matter retains its state of rest or uniform rectilinear motion in the absence of external forces; and gravitational mass, by which a body exerts forces of attraction on other bodies, and by which it reacts to those forces. Expressed in appropriate units, these two properties are numerically equal—a purely experimental fact, unexplained by theory. Albert Einstein made the equality of inertial and gravitational mass a fundamental principle (principle of equivalence), as one of the two postulates of the theory of general relativity. See Gravitation, Inertia, Mass, Relativity, Weight

In quantum mechanics, mass is only one among many properties (quantum numbers) that a particle can have, for example, electric charge, spin, and parity. The nearest quantum-mechanical analogs of traditional matter are fermions, having half-integral values of spin. Forces are mediated by exchange of bosons, particles having integral spins. Fermions correspond to classical matter in exhibiting impenetrability (a consequence of the exclusion principle), but the correspondence is only rough. For example, fermions can also be exchanged in interactions (a photon and an electron can exchange an electron), and they also exhibit wavelike (nonlocalized) behavior. States of classical matter-particles were given by their positions and momenta, but in quantum mechanics it is impossible to assign simultaneous precise positions and momenta to particles. See Exclusion principle, Quantum electrodynamics, Quantum mechanics, Quantum statistics

The primary constituents of ordinary matter are baryonic, consisting of quarks. However it is possible that as much as 99% (by mass) of the matter in the universe consists of nonbaryonic “dark matter” whose nature is yet to be discovered. See Baryon, Quarks

Matter

“a philosophical category denoting the objective reality which is given to man by his sensations and which is copied, photographed, and reflected by our sensations, while existing independently of them” (V. I. Lenin, Poln. sobr. soch., 5th ed., vol. 18, p. 131). Matter is the infinite multitude of all the objects and systems in the world and the substratum of all properties, connections, relations, and forms of motion. Matter comprises not only all directly observable natural objects and bodies, but also all those which in principle will be known in the future with improvement of the means of observation and experiment. The entire world around us is moving matter in its infinitely diverse forms and manifestations and with all its properties, connections, and relations. The Marxist-Leninist conception of matter is organically related to the dialectical materialist answer to the basic question of philosophy. This conception is based on the principle of the material unity of the world and the primacy of matter over human consciousness and on the principle of the knowability of the world through the consistent study of matter’s specific properties, connections, and forms of motion.

In pre-Marxist philosophy and natural science, matter as a philosophical category was often identified with specific types of matter, such as physical substance or the atoms of chemical compounds, or with such properties of matter as mass, which was regarded as a measure of the quantity of matter. In reality, physical substance encompasses not all matter, but only those objects and systems that have a non-zero rest mass. There also exist types of matter that have no rest mass: the electromagnetic field and its quanta (photons), the gravitational field, and neutrinos.

The reduction of matter as objective reality to particular states and properties of matter provoked crises in the history of science, as was the case in the late 19th and early 20th centuries, when the identification of matter with indivisible atoms and material substance was shown to be invalid, and some idealistically minded physicists concluded that “matter has disappeared,” “materialism has now been refuted,” and so on. These conclusions were erroneous, but further elaboration of the dialectical materialist conception of matter and its basic properties was required to overcome the methodological crisis in physics.

The term “antimatter,” denoting various antiparticles, such as antiprotons, antineutrons, and positrons, and the micro- and macro-systems composed of them, is frequently encountered. This term is not precise, for in actuality all these entities are particular types of matter, antiparticles of material substance, or antisubstance. The world may contain a multitude of other, as yet unknown types of matter with extraordinary specific properties, but they are all elements of the objective reality that exists independently of consciousness.

In pre-Marxist materialism, matter was often defined as the substance (foundation) of all things and phenomena, a view that opposed the idealist religious conception of the world, which interpreted substance as god’s will, the absolute spirit, or human consciousness, which was separated from the brain, made absolute, and deified. At the same time material substance was often construed as prime matter and reduced to primary and structureless elements that were identified with indivisible atoms. It was believed that while various objects and material formations can arise and disappear, substance cannot be created or destroyed and is always stable in its essence. Change occurs only in the specific forms of its existence, in the quantitative combinations and relative positions of the elements.

In modern science the concept of substance has undergone radical change. Dialectical materialism recognizes the substantiality of matter, but only in a restricted sense, as it relates to the materialist solution of the basic problem of philosophy and to the revelation of the nature of various properties and forms of the motion of bodies. Matter and not consciousness or an imaginary divine spirit is the substance of all properties, relations, and forms of motion that exist in the world and the ultimate basis of all spiritual phenomena. No property or form of motion can exist in and of itself; it is always inherent in a specific material formation, which is its substratum. In this sense the concept of substance is also equivalent to the concept of the material substratum of various processes and phenomena. Recognition of the substantiality and absolute nature of matter is also equivalent to the principle of the material unity of the world, which is confirmed by the entire historical development of science and practice.

However, it is important to take into account the fact that matter itself exists only as an infinite diversity of specific formations and systems. In the structure of each of these specific forms of matter there is no primary, structureless, and immutable substance underlying all properties of matter. Every material object has an inexhaustible diversity of structural connections and is capable of internal changes and transformations into qualitatively different forms of matter. “The ’essence’ of things, or ’substance,’ “wrote Lenin, “is also relative; it expresses only the degree of profundity of man’s knowledge of objects; and while yesterday the profundity of this knowledge did not go beyond the atom, and today does not go beyond the electron and ether, dialectical materialism insists on the temporary, relative, approximate character of all these milestones in the knowledge of nature gained by the progressing science of man. The electron is as inexhaustible as the atom, nature is infinite” (ibid., p. 277).

Nevertheless, it is always important for the progress of scientific knowledge and for refuting various idealist concepts to show the material substratum that underlies the phenomena, properties, and forms of motion of the objective world that are studied at a particular time. Thus the revelation of the substratum of thermal, electrical, magnetic, and optical processes and of various chemical reactions was of great importance historically, for it led to the development of the theory of the atomic structure of matter, the theory of the electromagnetic field, and quantum mechanics. Today, science faces such tasks as revealing the structure of elementary particles and studying in greater depth the material foundations of heredity and the nature of consciousness. The fulfillment of these tasks will advance human knowledge to encompass new, deeper structural levels of matter. “Human thought goes endlessly deeper from appearance to essence, from essence of the first order, as it were, to essence of the second order, and so on without end” (ibid., vol. 29, p. 227).

Material objects always have internal order and systemic organization. Order is manifested in the regular motion and interaction of all elements of matter, through which they are united into systems. A system is an internally ordered set of interconnected elements. The relation among elements in a system is more stable, essential, and internally necessary than the relation of each of the elements to the environment and to elements of other systems. Man’s knowledge of the structural organization of matter is relative and changeable, depending on the constantly expanding possibilities of experiments, observations, and scientific theories. But it makes specific and supplements the philosophical conception of matter as objective reality.

Modern science recognizes the following types of material systems and corresponding structural levels of matter: elementary particles and fields (such as the electromagnetic and gravitational fields), atoms, molecules and macroscopic bodies of various dimensions, geological systems, the earth and other planets, stars, intragalactic systems (such as diffuse nebulas and star clusters), the Milky Way Galaxy, systems of galaxies, and the metagalaxy, whose boundaries and structure have not yet been established. The current boundaries of knowledge of the structure of matter extend from 10^-14 cm to 10²⁸ cm (approximately 13 billion light-years), but even within this range there may exist a multitude of as yet unknown types of matter. Such objects as quasars and pulsars were discovered in the 1960’s.

Animate matter and socially organized matter thus far are known to exist only on earth. Their appearance was the result of the natural and law-governed self-development of matter, which is just as inseparable from its existence as motion, the quality of structure, and other properties. Animate matter is the entire aggregate of organisms capable of reproduction and the transfer and accumulation of genetic information in the course of evolution. Socially organized matter is the highest form of development of life—an aggregate including both individuals having the capacity to think and consciously transform reality and also communities of various levels. These types of matter also have a systemic organization. The structure of social systems also includes various technical material systems that have been created by man to achieve set goals.

At each stage of cognition it would have been incorrect to identify the philosophical conception of matter as objective reality with the specific scientific concepts of its structure and forms, for in that event all as yet unknown but existing objects and systems would have been excluded from the structure of matter. This is inaccurate and contradicts the principle of the material unity of the world, a unity that has a multitude of specific manifestations revealed by science and practice. This unity is manifested in the universal connection and mutual conditioning of objects and phenomena, in the possibility of mutual conversion of forms of moving matter into other forms, in the relation and mutual conversion of types of motion and energy, and in the historical development of nature and the emergence of more complex forms of matter and motion from relatively less complex ones. The material unity of the world is also manifested in the interconnection of all structural levels of matter and in the interdependence of the phenomena of the microcosm and macrocosm. This unity is also reflected in the fact that matter has a set of universal properties and dialectical laws governing structural organization, change, and development. Among the universal properties of matter are its inability to be created or destroyed, its eternal existence in time and infiniteness in space, and the inexhaustibility of its structure. Motion, change, and law-governed self-development, manifested in various forms, and the conversion of states into other states are always inherent in matter.

Space and time are universal forms of the existence of matter that do not exist apart from it, just as material objects without spatial and temporal properties could not exist. A universal property of matter is the determinacy of all phenomena and their dependence on structural relations in material systems, on external factors, and on the causes and conditions that give rise to them. Interaction leads to the mutual change of bodies (or of their states) and to their reflection of each other. Reflection, which is manifested in all processes, depends on the structure of the interacting systems and on the character of external influences. The historical development of the property of reflection leads, in the course of the evolution of animate nature and society, to the appearance of its highest form—abstract and constantly perfectible thought—by means of which matter comes, as it were, to a realization of the laws governing its own existence and to its own goal-directed change. The universal properties of matter are also manifested in the universal laws of its existence and development: the law of the unity and struggle of opposites, the mutual transitions of quantitative and qualitative changes, the law of causality, and other very important aspects of material existence revealed by dialectical materialism and all modern science.

REFERENCES

Engels, F. “Anti-Dühring, otd. pervyi.” In K. Marx and F. Engels, Soch., 2nd ed., vol. 20.
Engels, F. “Dialektika prirody.” Ibid.
Lenin, V. I. “Materializm i empiriokrititsizm.” Poln. sobr. soch., 5th ed., vol. 18.
Lenin, V. I. “Karl Marks.” Ibid., vol. 26.
Arkhiptsev, F. T. Materiia kak filosofskaia kategoriia. Moscow, 1961.
Dialektika v naukakh o nezhivoi prirode, part 2. Moscow, 1964.
Filosofskie problemy fiziki elementarnykh chastits. Moscow, 1963.
Meliukhin, S. T. Materiia ve ee dinstve, beskonechnosti i razvitii. Moscow, 1966.
Meliukhin, S. T. Material’noe edinstvo mira v svete sovremennoi nauki. Moscow, 1967.
Struktura i for my materii. Moscow, 1967.
Kedrov, B. M. Lenin i revoliutsiia v estestvoznanii XX veka. Moscow, 1969.
Issledovaniia po obshchei teorii sistem. Moscow, 1969.
Lenin i sovremennoe estestvoznanie. Moscow, 1969.
Gott, V. S. Filosofskie voprosy sovremennoi fiziki. Moscow, 1972.

S. T. MELIUKHIN

matter

[′mad·ər] (physics) The substance composing bodies perceptible to the senses; includes any entity possessing mass when at rest.

matter

1. Philosophy (in the writings of Aristotle and the Scholastics) that which is itself formless but can receive form and become substance 2. Philosophy (in the Cartesian tradition) one of two basic modes of existence, the other being mind: matter being extended in space as well as time 3. a secretion or discharge, such as pus 4. Lawa. something to be proved b. statements or allegations to be considered by a court

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The Properties of Matter

The States of Matter

Early Theories of Matter

Modern Theory of Matter

Physical and Chemical Changes

The Relationship of Matter and Energy

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Synonyms for matter

noun situation

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noun substance

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noun content

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noun pus

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noun importance

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noun problem

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verb be important

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phrase as a matter of fact

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phrase no matter

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noun that which occupies space and can be perceived by the senses

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noun that from which things are or can be made

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noun what a speech, piece of writing, or artistic work is about

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noun something to be done, considered, or dealt with

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verb to be of significance or importance

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noun a vaguely specified concern

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noun some situation or event that is thought about

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noun that which has mass and occupies space

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noun a problem

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noun (used with negation) having consequence