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Units of Measurement

Derived SI Units with Special Names

Physical Quantity Quantity
symbol
SI Unit Unit
Symbol
Expression in SI base units Alternative expressions
frequencyv, fhertz Hz s-1 -
force Fnewton N kg m s-2 J m-1
pressure ppascal Pa kg m-1 s-2N m-2
energy (all forms) E, U, V, W,etc.joule J kg m2 s-2N m = C V = V A s
power Pwatt W kg m2 s-3J s-1 = VA
electric chargeQcoulomb C A s -
electric potential differenceE, φ, ζ, Φ, η, etc. volt V kg m2 s-3 A-1 J A-1 s-1 = J C-1
electrical capacitance Cfarad F A2 s4 kg-1 m-2C V-1
electrical resistance Rohm Ω kg m2 s-3 A-2V A-1
electrical conductance Gsiemens S A2 s3 kg-1 m-2 A V-1 = Ω-1
magnetic flux Φweber Wb kg m2 s-2 A-1 V s = T m2
magnetic induction Btesla T kg s-2 A-1 Wb m-2 = N A-1 m-1
inductance L, Mhenry H kg m2 s-2 A-2 V A-1 s = Wb A-1
luminous flux Φlumen lm cd sr -
illuminationElux lx cd sr m-2 lm m-2
activity (of a radionuclide) Abecquerel Bq s-1-
absorbed dose Dgray Gy m2 s-2J kg-1
dose equivalent Hsievert Sv m2 s-2J kg-1
catalytic activityzkatalkatmol s-1-
Celsius temperaturetdegree Celsius°C K-
plane angle α , β , γ , θ , Φ radian rad m m-1 dimensionless
solid angle ω , Ωsteradian sr m2 m-2 dimensionless
Table 3. SI derived units with special names.

The special names and symbols of the 22 SI derived units with special names and symbols given in table 3 above may themselves be included in the names and symbols of other SI derived units, as shown in table 5.

Note on degree Celsius. The derived unit in Table 3 with the special name degree Celsius and special symbol °C needs comment. The way temperature scales used to be defined, it remains common practice to express a thermodynamic temperature, symbol T, in terms of its difference from the reference temperature T0 = 273.15 K. This temperature difference is called a Celsius temperature, symbol t, and is defined by the quantity equation

t= T- T0.

The unit of Celsius temperature is the degree Celsius, symbol °C. The numerical value of a Celsius temperature t expressed in degrees Celsius is given by

t/°C = T/K - 273.15.

It follows from the definition of t that the numerical value of a given temperature difference or temperature interval will be the same for both degree Celsius and the kelvin.


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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