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#

 Name Symbol Measure metre Show source$m$ length kilogram Show source$kg$ mass second Show source$s$ time ampere Show source$A$ electric current kelvin Show source$K$ thermodynamic temperature mole Show source$mol$ amount of substance candela Show source$cd$ luminous intensity

# Selected derived units#

 Name Symbol Measure radian Show source$rad$ angle steradian Show source$sr$ solid angle hertz Show source$Hz$ frequency newton Show source$N$ force pascal Show source$Pa$ pressure, stress joule Show source$J$ energy, work, heat watt Show source$W$ power, radiant flux coulomb Show source$C$ electric charge or quantity of electricity volt Show source$V$ voltage (electrical potential) farad Show source$F$ capacitance ohm Show source$\Omega$ resistance, impedance, reactance siemens Show source$S$ electrical conductance weber Show source$Wb$ magnetic flux tesla Show source$T$ magnetic flux density henry Show source$H$ inductance Celsius degree Show source$^{\circ}C$ temperature relative to 273.15 K lumen Show source$lm$ luminous flux lux Show source$lx$ illuminance becquerel Show source$Bq$ radioactivity (decays per unit time) gray Show source$Gy$ absorbed dose (of ionizing radiation) sievert Show source$Sv$ equivalent dose (of ionizing radiation) katal Show source$kat$ catalytic activity square meter Show source$m^2$ area cubic meter Show source$m^3$ volume meter per second Show source$\frac{m}{s}$ velocity meter per square second Show source$\frac{m}{s^2}$ acceleration kilogram per cubic meter Show source$\frac{kg}{m^3}$ density newton per square meter Show source$\frac{N}{m^2}$ specific gravity volt per meter Show source$\frac{V}{m}$ magnitude of the electric field ampere per meter Show source$\frac{A}{m}$ 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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