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SI Derived Units

Expressed in Terms of SI Derived Units with Special Names

Derived quantityQuantity
symbol
NameExpression in SI base units Alternative SI expressions
angular velocityωradian per seconds-1 rad s-1
angular accelerationαradian per second squareds-2 rad s-2
angular momentumLjoule secondkg m2 s-1J s
momentumPnewton secondkg m s-1N s
dynamic viscosityηpascal secondkg m-1s-1 Pa s
surface tensionγ, σnewton per metrekg s-2 N m-1 = J m-2
moment of forceυnewton metrekg m2 s-2 N m = J
heat flux density,
irradiance
Qwatt per square metrekg s-3 W m-2
heat capacity, entropySjoule per kelvinkg m2 s-2 K-1 J K-1 = C V K-1
specific heat capacity,
specific entropy
cjoule per kilogram kelvin m2 s-1 K-1J kg-1 K-1
specific energyEjoule per kilogramm2 s-2 J kg-1
thermal conductivityλwatt per metre kelvin kg m2 s-3 K-1W m-1 K-1
electric conductivityσ, κsiemens per metre A2 s3 kg-1 m-3 S m-1 = Ω-1 m-1
= A V-1 m-1
electric resistivityρohm metre kg m3 A-2 s-3 Ω m = m S-1
= V m A-1
energy densityujoule per cubic metrekg m-1 s-2 J m-3 = N m-2
= C m-3
electric field strengthEvolt per metrekg m s-3 A-1 V m-1
electric charge densityρcoulomb per cubic metreA s m-3 C m-3
electric flux densityσcoulomb per square metre A s m-2C m-2
permittivityεfarad per metreA2 s4 kg-1 m-3F m-1
permeabilityμhenry per metrekg m s-2 A-2 H m-1
molar energyUm, Hm, etc.joule per mole kg m2 s-2 mol-1J mol-1
molar entropy,
molar heat capacity
Sm, Cc,m, Cp,m joule per mole kelvinkg m2 s-2 mol-1 K-1 J mol-1 K-1
exposure
(x and γ rays)
-coulomb per kilogramA s kg-1 C kg-1
absorbed dose rate-gray per secondm2 s-3 Gy s-1 = J kg-1 s-1
radiant intensityP'watt per steradiankg m2 s-3 sr-1W sr-1
radianceLwatt per square metre steradiankg s-3 sr-1 W m-2 sr-1
catalytic (activity)
concentration
-katal per cubic metre mol m-3 s-1kat m-3
Table 5. SI derived units expressed in terms of SI derived units with special names.

The above table shows some derived quantities and units expressed in terms of SI units with special names. Some derived quantities like moment of force (newton metre) and thermodynamic energy (joule) are both quantities of energy (kg m2 s-2) but are very often expressed differently.

Si Units:
SI Base Units
SI Derived Units
expressed with special names
expressed in terms of SI base units
expressed in terms in terms of SI units with special names
SI Unit Prefixes
Non-SI Units
accepted by SI
currently accepted by SI
derived CGS units with special names
other non-SI units
Constants
Glossary of Units







CONVERSION CALCULATORS

Convert between Different Units of Measurement

Index of Unit Converters
ACCELERATION
ANGLE
AREA
AREA
DENSITY
DENSITY
DISTANCE
DYNAMIC
VISCOSITY
ENERGY
ENERGY
DENSITY
ENTROPY
FEED RATE
FLOW RATE
FORCE
FUEL
CONSUMPTION
HEAT
CAPACITY
HEAT FLUX
DENSITY
HEAT TRANSFER
COEFFICIENT
IRRADIANCE
KINEMATIC
VISCOSITY
LENGTH
MASS
POWER
PRESSURE
SPECIFIC
ENERGY
SPECIFIC
ENTHALPY
SPECIFIC
ENTROPY
SPECIFIC HEAT
CAPACITY
SPECIFIC
VOLUME
SPEED
TEMPERATURE
THERMAL
CONDUCTIVITY
TIME
TORQUE
VELOCITY
VOLUME
VOLUMETRIC
HEAT CAPACITY
Unit Prefixes
Plasma
Gas Flow
Hardness
MPa - GPa
Computing
Bits and Bytes

To use the measurement conversion calculators simply enter a number value into the desired field and click calculate. All results shown will be equivalent values. Values are given to seven significant figures ( the odd result may show 9's or 0's over running). Values of 10 000 or greater will be displayed in the e-format e.g. 2.3456e7 which equals 2.3456 x 107 or 23 456 000. Values lower than 0.001 will be displayed in the e-format e.g. 2.3456e-5 which equals 2.3456 x 10-5 or 0.000 023456. The calculators require that your browser has java script enabled. View all measurement unit conversion calculators on the same page (may not work with all browsers; requires Iframe).



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