| 释义 |
density
den·si·ty D0134200 (dĕn′sĭ-tē)n. pl. den·si·ties 1. The quality or condition of being dense.2. a. The quantity of something per unit measure, especially per unit length, area, or volume.b. The mass per unit volume of a substance under specified conditions of pressure and temperature.3. Computers A measure of the number of bits that can be stored in a given amount of physical space on a storage medium.4. The number of individuals, such as inhabitants or housing units, per unit of area.5. The degree of optical opacity of a medium or material, as of a photographic negative.6. Thickness of consistency; impenetrability.7. Complexity of structure or content.8. Stupidity; dullness.density (ˈdɛnsɪtɪ) n, pl -ties1. the degree to which something is filled, crowded, or occupied: high density of building in towns. 2. obtuseness; stupidity3. (General Physics) a measure of the compactness of a substance, expressed as its mass per unit volume. It is measured in kilograms per cubic metre or pounds per cubic foot. Symbol: ρ See also relative density4. (General Physics) a measure of a physical quantity per unit of length, area, or volume. See charge density, current density5. (General Physics) physics photog See transmission density, reflection densityden•si•ty (ˈdɛn sɪ ti)
n., pl. -ties. 1. the state or quality of being dense; compactness. 2. stupidity; obtuseness. 3. the average number of inhabitants, dwellings, or the like, per unit of area: a population density of 100 persons per square mile. 4. Physics. mass per unit volume. 5. the degree of opacity of a substance, medium, etc., that transmits light. 6. the relative degree of opacity of an area of a photographic negative or transparency, often expressed logarithmically. 7. a measure of how much data can be stored in a given amount of space on a disk or other computer storage medium. [1595–1605; < Latin] den·si·ty (dĕn′sĭ-tē) A measure of the compactness of a substance. Density is equal to the amount of mass per unit of volume. In general, density increases as pressure increases and temperature decreases.densityMass per unit volume.Thesaurus| Noun | 1. |  density - the amount per unit size densenesscompactness - the consistency of a compact solidbits per inch, bpi - a measure of how densely information is packed on a storage mediumflux density, flux - (physics) the number of changes in energy flow across a given surface per unit areaabsorbance, optical density, photographic density, transmission density - (physics) a measure of the extent to which a substance transmits light or other electromagnetic radiationlow density, rarity, tenuity - a rarified quality; "the tenuity of the upper atmosphere"relative density - the ratio of the density of something to the density of a standard | | 2. | density - the spatial property of being crowded togethercompactness, concentration, denseness, tightnessspatial arrangement, spacing - the property possessed by an array of things that have space between them |
densitynoun1. tightness, closeness, thickness, compactness, impenetrability, denseness, crowdedness The region has a high population density.2. mass, body, bulk, consistency, solidity Jupiter's moon Io has a density of 3.5 grams per cubic centimetre.densitynounThe quality, condition, or degree of being thick:compactness, solidity, thickness.Translationsdense (dens) adjective1. thick and close. We made our way through dense forest; The fog was so dense that we could not see anything. 稠密的 稠密的2. very stupid. He's so dense I have to tell him everything twice. 愚鈍的 愚钝的ˈdensely adverb very closely together. The crowd was densely packed. 密集地 密集地ˈdensity noun1. the number of items, people etc found in a given area compared with other areas especially if large. the density of the population. 密集度 密集度2. the quantity of matter in each unit of volume. the density of a gas. 密度 密度density
density, ratio of the 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. of a substance to its volume, expressed, for example, in units of grams per cubic centimeter or pounds per cubic foot. The density of a pure substance varies little from sample to sample and is often considered a characteristic property of the substance. Most substances undergo expansion when heated and therefore have lower densities at higher temperatures. Many substances, especially gases, can be compressed into a smaller volume by increasing the pressure acting on them. For these reasons, the temperature and pressure at which the density of a substance is measured are usually specified. The density of a gas is often converted mathematically to what it would be at a standard temperature and pressure (see STP). Water is unusual in that it expands, and thus decreases in density, as it is cooled below 3.98°C; (its temperature of maximum density). Density often is taken as an indication of how "heavy" a substance is. Iron is denser than cork, since a given volume of iron is more massive (and weighs more) than the same volume of cork. It is often said that iron is "heavier" than cork, although a large volume of cork obviously can be more massive and thus be heavier (i.e., weigh more) than a small volume of iron. See specific gravityspecific gravity,
ratio of the weight of a given volume of a substance to the weight of an equal volume of some reference substance, or, equivalently, the ratio of the masses of equal volumes of the two substances.
..... Click the link for more information. .Density The mass per unit volume of a material. The term is applicable to mixtures and pure substances and to matter in the solid, liquid, gaseous, or plasma state. Density of all matter depends on temperature; the density of a mixture may depend on its composition, and the density of a gas on its pressure. Common units of density are grams per cubic centimeter, and slugs or pounds per cubic foot. The specific gravity of a material is defined as the ratio of its density to the density of some standard material, such as water at a specified temperature, for example, 60°F (15.6°C), or, for gases the basis may be air at standard temperature and pressure. Another related concept is weight density, which is defined as the weight of a unit volume of the material. See Mass, Weight density 1. Symbol: ρ. The mass per unit volume of a body or material. The mean density of a celestial body is its total mass divided by its total volume. A wide variation in densities is found in the Universe, ranging from about 10–20 kg m–3 for interstellar gas to over 1017 kg m–3 for neutron stars. The mean density of matter in the Universe is of the order of 10–27 kg m–3. 2. The number of electrons, ions, or other particles per unit volume.DensityA planning or zoning unit of measurement of the ratio between buildings per acre, or occupants per gross square foot of floor area, according to the type of zoning for that particular area under consideration, such as commercial residential, rural, and the like.Density in textiles, the content of fibrous material per unit volume. The density of a weave determines the strength and appearance of the fabric. It is usually expressed by the number of warp threads per unit of width and the number of filling threads per unit of length—that is, the ratio of absolute density along warp and filling. When the linear density (fineness) of the threads varies, a ratio of relative density is used, expressed by a filling coefficient—linear, surface, or volume—representing the relationship of the linear measurements of surface or volume to the overall width, length, surface, or volume of a unit of material. The relative density is determined basically by the type of fiber interlacing used in the weave. For a weave of normal density, about 40 or 50 percent of the volume of a fabric consists of fibrous material. density[′den· səd·ē] (materials) Closeness of texture or consistency. (mathematics) For an increasing sequence of integers, the greatest lower bound of the quantity F (n)/ n, where F (n) is the number of integers in the sequence (other than zero) equal to or less than n. (mechanics) The mass of a given substance per unit volume. (optics) The degree of opacity of a translucent material. The common logarithm of opacity. (physics) The total amount of a quantity, such as energy, per unit of space. densityThe degree of aggregation; the quantity of any entity distributed over an area per unit of areal measure, e.g., persons per acre, families per acre, or dwelling units per square mile.density1. a measure of the compactness of a substance, expressed as its mass per unit volume. It is measured in kilograms per cubic metre or pounds per cubic foot. 2. a measure of a physical quantity per unit of length, area, or volume 3. Physics Photog See transmission density reflection densitydensity
density [den´sĭ-te] 1. the ratio of the mass of a substance to its volume.2. the quality of being compact.3. the quantity of matter in a given space.4. the quantity of electricity in a given area, volume, or time.5. the degree of film blackening in an area of a photograph or radiograph.den·si·ty (ρ), (den'si-tē), 1. The compactness of a substance; the ratio of mass to unit volume, usually expressed as g/cm3 (kg/m3 in the SI). 2. The quantity of electricity on a given surface or in a given time per unit of volume. 3. radiologic physics the opacity to light of an exposed radiographic or photographic film; the darker the film, the greater will be the measured density. 4. clinical radiology a less exposed area on a film, corresponding to a region of greater x-ray attenuation (radiopacity) in the subject; the more light transmitted by the film, the greater the density of the subject will be; this is not actually the opposite of sense 3, because one concerns film density and the other subject density. [L. densitas, fr. densus, thick] density The amount of a substance per unit volume Imaging 1. The compactness in a scan which reflects the type of tissues seen in CT and MR scans.2. The amount of 'hard' or mineralized tissue in a plain film. See Bone mineral, Current density, Muscle fiber density, Spin density, Vapor density.den·si·ty, pl. densities (dens'i-tē, -tēz) 1. The compactness of a substance; the ratio of mass to unit volume, usually expressed as g:cm3 (kg:m3 in SI). 2. The quantity of electricity on a given surface or in a given time per unit of volume. 3. radiologic physics The opacity to light of an exposed radiographic or photographic film; the darker the film, the greater the measured density. 4. clinical radiology A less-exposed area on a film, corresponding to a region of greater x-ray attenuation (radiopacity) in the subject; the more light transmitted by the film, the greater the density of the subject; this is not actually the opposite of the sense 3 definition, because one concerns film density and the other subject density. [L. densitas, fr. densus, thick]densityAn indication of the compactness of a substance. It is expressed as the ratio of the mass of the substance to its unit volume. The common units are g/cm3 and kg/m3. This property is usually given by lens manufacturers, the greater the density of a material, the greater its weight, all other factors being equal.den·si·ty, pl. densities (dens'i-tē, -tēz) 1. Compactness of a substance. 2. Quantity of electricity on a given surface or in a given time per unit of volume. 3. radiologic physics opacity to light of an exposed radiographic or photographic film; the darker the film, the greater the measured density. 4. clinical radiology a less exposed area on a film, corresponding to a region of greater x-ray attenuation (radiopacity) in the subject. [L. densitas, fr. densus, thick]Patient discussion about densityQ. what are the sources for high density lipoprotein? I have heard that high density lipoprotein is good for heart. What differences does it make in heart’s health and what are the sources for high density lipoprotein?A. Hi Liam, it is very important that we have high density lipoprotein (HDL) in our body. The fact is that the HDL is formed inside the body. They are known as good cholesterol as they are famous for their protection for heart against the heart diseases. It has been found that Vitamin B3 or Niacin consumption increases the count of HDL. It’s good to cut on the diet having more of saturated fats and oils, which increases the chances of heart attack. More discussions about densitydensity
densityIn zoning, the number of things allowed per unit of land, such as number of houses, occupants,or families per acre. AcronymsSeeDENSdensity
Related to density: relative density, specific gravity, Population densitySynonyms for densitynoun tightnessSynonyms- tightness
- closeness
- thickness
- compactness
- impenetrability
- denseness
- crowdedness
noun massSynonyms- mass
- body
- bulk
- consistency
- solidity
Synonyms for densitynoun the quality, condition, or degree of being thickSynonyms- compactness
- solidity
- thickness
Synonyms for densitynoun the amount per unit sizeSynonymsRelated Words- compactness
- bits per inch
- bpi
- flux density
- flux
- absorbance
- optical density
- photographic density
- transmission density
- low density
- rarity
- tenuity
- relative density
noun the spatial property of being crowded togetherSynonyms- compactness
- concentration
- denseness
- tightness
Related Words- spatial arrangement
- spacing
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