SI derived unit Guide, Meaning , Facts, Information and Description

SI derived units are part of the SI system of measurement units and are derived from the seven SI base units.

Table of contents

1 Units with Special names and Symbols 2 Other quantities and units 3 Conversion between kelvin and degrees Celsius 4 See also 5 References

Units with Special names and Symbols

Physical quantity	Name of SI unit	Symbol for SI unit	Expression in terms of other units	Expression in terms of SI base units
plane angle	radian	rad
solid angle	steradian	sr
frequency	hertz	Hz
force, weight	newton	N
pressure, stress	pascal	Pa
energy, work, heat	joule	J
power, radiant flux	watt	W
electric charge	coulomb	C
electric potential, electromotive force	volt	V
electric capacitance	farad	F
electrical resistance, impedance, reactance	ohm	Ω
electric conductance	siemens	S
magnetic flux	weber	Wb
magnetic flux density, magnetic inductivity	tesla	T
inductance	henry	H
temperature	degree Celsius	°C
luminous flux	lumen	lm
illuminance	lux	lx
activity (radioactive)	becquerel	Bq
absorbed dose (of radiation)	gray	Gy
dose equivalent (dose equivalent index)	sievert	Sv
catalytic activity	katal	kat

Other quantities and units

Physical quantity	Name of SI unit	Symbol for SI unit	Expression in terms of SI base units
area	square metre
volume	cubic metre
speed, velocity	metre per second
acceleration	metre per second squared
angular velocity	radian per second
momentum	newton second
angular momentum	newton metre second
moment of force	newton metre
wavenumber	reciprocal metre
density, mass density	kilogram per cubic metre
specific volume	cubic metre per kilogram
amount (-of-substance) concentration	mole per cubic metre
molar volume	cubic metre per mole
heat capacity, entropy	joule per kelvin
molar heat capacity, molar entropy	joule per kelvin mole
specific heat capacity, specific entropy	joule per kilogram kelvin
molar energy	joule per mole
specific energy	joule per kilogram
energy density	joule per cubic metre
surface tension	newton per metre
heat flux density, irradiance	watt per square metre
thermal conductivity	watt per metre kelvin
kinematic viscosity, diffusion coefficient	square metre per second
dynamic viscosity	pascal second
electric charge density	coulomb per cubic metre
electric current density	ampere per square metre
conductivity	siemens per metre
molar conductivity	siemens square metre per mole
permittivity	farad per metre
permeability	henry per metre
electric field strength	volt per metre
magnetic field strength	ampere per metre
luminance	candela per square metre
exposure (X and gamma rays)	coulomb per kilogram
absorbed dose rate	gray per second

Conversion between kelvin and degrees Celsius

One degree Celsius is equal to 1 kelvin.

Temperature in degrees Celsius = Temperature in kelvin - 273.15. Thus, one could think of the Kelvin scale as the same as the Celsius scale, with its zero point moved down to absolute zero. However, the official definition is that Celsius is Kelvin moved up.

Temperature differences are often measured in degrees Celsius; however, it doesn't matter: differences in temperature are equivalent whether Kelvin or degrees Celsius are used.

See also

• SI
• SI base unit

References

• I. Mills, Tomislav Cvitas, Klaus Homann, Nikola Kallay, IUPAC: Quantities, Units and Symbols in Physical Chemistry, 2nd edition (June 1993), Blackwell Science Inc (p. 72)

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