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 S_1/2 of atom ces ¹³³Cs.

Tags and links to this website#

Tags:

units_of_measurement · basic_si_units · derivated_si_units

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jednostki_miar · jednostki_podstawowe_si · jednostki_pochodne_si

What tags this calculator has#

TABLE · PHYSICS · STANDARDS · A -> Z (all)

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