Units of measurement table
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

ampereAAelectric current
kelvinKKthermodynamic temperature
molemolmolamount of substance
candelacdcdluminous intensity

Selected derived units

steradiansrsrsolid angle
pascalPaPapressure, stress
jouleJJenergy, work, heat
wattWWpower, radiant flux
coulombCCelectric charge or quantity of electricity
voltVVvoltage (electrical potential)
ohmΩ\Omegaresistance, impedance, reactance
siemensSSelectrical conductance
weberWbWbmagnetic flux
teslaTTmagnetic flux density
Celsius degreeC^{\circ}Ctemperature relative to 273.15 K
lumenlmlmluminous flux
becquerelBqBqradioactivity (decays per unit time)
grayGyGyabsorbed dose (of ionizing radiation)
sievertSvSvequivalent dose (of ionizing radiation)
katalkatkatcatalytic activity
square meterm2m^2area
cubic meterm3m^3volume
meter per secondms\frac{m}{s}velocity
meter per square secondms2\frac{m}{s^2}acceleration
kilogram per cubic meterkgm3\frac{kg}{m^3}density
newton per square meterNm2\frac{N}{m^2}specific gravity
volt per meterVm\frac{V}{m}magnitude of the electric field
ampere per meterAm\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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