Units of measurement table in SI system
Table shows various units (kilogram, metre, ampere etc.) and corresponding physical quantities (measurements). Both basic SI and selected derivated units are presented.

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Basic SI units#

metreShow sourcemmlength
kilogramShow sourcekgkgmass
secondShow sourcesstime
ampereShow sourceAAelectric current
kelvinShow sourceKKthermodynamic temperature
moleShow sourcemolmolamount of substance
candelaShow sourcecdcdluminous intensity

Selected derived units#

radianShow sourceradradangle
steradianShow sourcesrsrsolid angle
hertzShow sourceHzHzfrequency
newtonShow sourceNNforce
pascalShow sourcePaPapressure, stress
jouleShow sourceJJenergy, work, heat
wattShow sourceWWpower, radiant flux
coulombShow sourceCCelectric charge or quantity of electricity
voltShow sourceVVvoltage (electrical potential)
faradShow sourceFFcapacitance
ohmShow sourceΩ\Omegaresistance, impedance, reactance
siemensShow sourceSSelectrical conductance
weberShow sourceWbWbmagnetic flux
teslaShow sourceTTmagnetic flux density
henryShow sourceHHinductance
Celsius degreeShow sourceC^{\circ}Ctemperature relative to 273.15 K
lumenShow sourcelmlmluminous flux
luxShow sourcelxlxilluminance
becquerelShow sourceBqBqradioactivity (decays per unit time)
grayShow sourceGyGyabsorbed dose (of ionizing radiation)
sievertShow sourceSvSvequivalent dose (of ionizing radiation)
katalShow sourcekatkatcatalytic activity
square meterShow sourcem2m^2area
cubic meterShow sourcem3m^3volume
meter per secondShow sourcems\frac{m}{s}velocity
meter per square secondShow sourcems2\frac{m}{s^2}acceleration
kilogram per cubic meterShow sourcekgm3\frac{kg}{m^3}density
newton per square meterShow sourceNm2\frac{N}{m^2}specific gravity
volt per meterShow sourceVm\frac{V}{m}magnitude of the electric field
ampere per meterShow sourceAm\frac{A}{m}magnitude of the magnetic field

Some facts#

  • To determine the quantity/value/amount of the selected physical quantity (e.g. mass), we need a standard definition of the unit relative to which we compare quantities. We call this standard a unit of measure.
  • Theoretically, there is freedom in the selection of units of measurement, but for practical reasons, they are chosen in such a way that the usage of them is practical and easy.
  • In order to standardize, units of measurement are grouped in the so-called measurement unit systems. Currently, in most regions of the world, the applicable unit of measurement system is SI system.
  • An example of a unit of measure is a kilogram. When making a mass measurement, we determine how many times heavier or how many times lighter the examined body is relative to the prototype body with known mass of 1kg. Perhaps the most direct example of such a measurement is the use of a weighing scale, where we place the examined object on one side and prototype weight on another.
  • In the case of a kilogram, the unit of measure is defined by a physically existing object, but this is not always possible. For example, one second is defined as a time equal to 9 192 631 770 periods corresponding to the transition between two levels F=3 and F=4 basic state S1/2 of atom ces 133Cs.

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