SI unit

n (Units) any of the units adopted for international use under the Système International d'Unités, now employed for all scientific and most technical purposes. There are seven fundamental units: the metre, kilogram, second, ampere, kelvin, candela, and mole; and two supplementary units: the radian and the steradian. All other units are derived by multiplication or division of these units without the use of numerical factors

SI unit

n. any of the basic units of measure in the International System of Units.

Thesaurus

Noun

SI unit - a complete metric system of units of measurement for scientists; fundamental quantities are length (meter) and mass (kilogram) and time (second) and electric current (ampere) and temperature (kelvin) and amount of matter (mole) and luminous intensity (candela); "Today the United States is the only country in the world not totally committed to the Systeme International d'Unites"International System, International System of Units, SI system, Systeme International, Systeme International d'Unites, SImetric system - a decimal system of weights and measures based on the meter and the kilogram and the second

SI unit

unit

[u´nit] 1. a single thing; one segment of a whole that is made up of identical or similar segments.2. a specifically defined amount of anything subject to measurement, as of activity, dimension, velocity, volume, or the like.3. a distinct part of a hospital, usually having a specific physical location and serving a defined function; see under names of specific units.Ångström unit angstrom.atomic mass unit (u) (amu) the unit of mass equal to ¹⁄₁₂ the mass of the nuclide of carbon 12. Called also dalton.autonomous nursing unit a nursing unit under a decentralized administration system in which the staff is responsible for all aspects of unit functioning.British thermal unit (BTU) a unit of heat formerly widely used, being the amount necessary to raise the temperature of 1 pound of water from 39° to 40°F., equal to approximately 252 calories" >calories.CH50 unit the amount of complement that will lyse 50 per cent of a standard preparation of sheep red blood cells coated with antisheep erythrocyte antibody. continuing education unit (CEU) a unit of credit for educational offerings given to professional persons, determined by a professional organization according to a mathematical formula after a thorough review of the program of study, the qualifications of the instructors, and the program objectives.critical care unit intensive care unit.electrostatic u's (esu) that system of units that is based on the fundamental definition of a unit charge as one that will repel a similar charge with a force of 1 dyne when the two charges are 1 cm apart in a vacuum.environmental control unit a computerized system that allows the handicapped individual to operate several different appliances using a keyboard or other input device.heat unit the amount of heat energy that is produced by one kVp (kilovolt peak) and one mA (milliampere) for one second with single phase, full wave rectified radiographic equipment.Hounsfield unit an arbitrary unit of x-ray attenuation used for CT scans. Each voxel is assigned a value on a scale in which air has a value of −1000; water, 0; and compact bone, +1000.intensive care unit see intensive care unit.International unit (IU) 1. a unit of enzyme activity equal to the amount of enzyme that catalyzes the conversion of one micromole of substrate or coenzyme per minute under specified conditions (temperature, pH, and substrate concentration) of the assay method. Abbreviated U.2. any of several arbitrary units that have been adopted by international bodies to express the quantities of certain vitamins (A, C, D, and thiamine hydrochloride), hormones (androgen, chorionic gonadotropin, estradiol benzoate, estrone, insulin, progesterone, and prolactin), and drugs (digitalis and penicillin).Kienböck's unit a unit of x-ray exposure equal to 0.1 erythema dose; symbol X.motor unit the unit of motor activity formed by a motor nerve cell and its many innervated muscle fibers.postanesthesia care unit (PACU) a specialty unit in a hospital for giving care" >postanesthesia care (care of patients recovering from anesthesia and intravenous sedation); formerly called recovery room.radiologic u's units used to measure radiation, including roentgens, rads, rems, and curies.u's of service (UOS) 1. the number of procedures done by a department.2. individuals or groups of individuals who are the recipients of nursing care.short procedures unit (short term care unit) a nursing unit where patients are briefly cared for following a medical or surgical procedure and are then discharged without spending the night.SI unit any unit of the International System of units (the metric system" >metric system); see also si units.step-down unit a nursing unit designated to provide care for patients who are stable enough to be discharged from the intensive care unit but are not yet ready to be cared for on a medical-surgical unit.Svedberg unit (S) a unit equal to 10⁻¹³ second used for expressing sedimentation coefficients of macromolecules.Svedberg flotation unit (S_f) a unit equal to 10⁻¹³ second used for expressing negative sedimentation coefficients of macromolecules that float rather than sink in a centrifuge, e.g., lipoproteins.terminal respiratory unit the functional unit of the lung, including a respiratory bronchiole, alveolar ducts and sacs, and alveoli; called also primary lobule of lung and primary respiratory lobule.USP unit one used in the United States Pharmacopeia for expressing potency of drugs and other preparations.

SI unit

Abbreviation of Système International d'unités (or International System of Units). It is derived from the metric system of physical units. There are seven base units, two supplementary units and many derived units. See candela per square metre; lumen; lux; micrometre (micron); nanometre.

Table S2 Base and supplementary SI units, and some derived units
physical quantity		name		symbol
base units
length		metre		m
mass		kilogram		kg
time		second		s
electric current		ampere		A
thermodynamic temperature		kelvin		K
luminous intensity		candela		cd
amount of substance		mole		mol
supplementary units
plane angle		radian	rad
solid angle		steradian	sr
some derived units
area	square metre		m²
electric potential difference	volt		V
electric resistance	ohm		Ω
energy	joule
force	newton		N
frequency	hertz		Hz
illuminance	lux		lx
luminance	candela per square metre		cd/m²
luminous flux	lumen		lm
power	watt		W
velocity	metre per second		m/s
volume	cubic metre		m³

SI unit

SI unit

SI unit

SI unit

SI unit

SI unit

unit

SI unit

SI unit

Synonyms for SI unit

noun a complete metric system of units of measurement for scientists

Synonyms

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