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NOTICE:
This Legacy journal article was published in Volume 4, February 1994, and has not been
updated since publication. Please use the search facility above to find regularly-updated information about
this topic elsewhere on the HEASARC site.
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Table 1
IAU-recommended basic units allowed within OGIP datasets &
software
Quantity Unit Meaning Notes
String
S1 base & supplementary units
length m metre
mass kg kilogram
time s second of time (incl sidereal time if appropriate)
plane angle rad radian (but see text)
solid angle sr steradian
temperature K kelvin
electric current A ampere
amount of substance mol mole
luminous intensity cd candela
IAU recognized derived units
frequency Hz hertz s-1
energy J joule N m
power W watt J s-1
electric potential V volts J C-1
force N newton kg m s-2
pressure, stress Pa pascal N m-2
electric charge C coulomb A s
electric resistance ohm ohm V A--1 (see text)
electric conductance S siemens A V-1
electric capacitance F farad C V-1
magnetic flux Wb weber V s
magnetic flux density T tesla Wb m-2
inductance H henry Wb A-1
luminous flux lm lumen cd sr
illuminance lx lux lm m-2
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