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87 lines
2.9 KiB
XML
87 lines
2.9 KiB
XML
<?xml version="1.0" encoding="US-ASCII"?>
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<!--
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Copyright 2008, 2009 University Corporation for Atmospheric Research
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This file is part of the UDUNITS-2 package. See the file LICENSE
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in the top-level source-directory of the package for copying and
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redistribution conditions.
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SI base units.
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-->
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<unit-system>
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<unit>
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<!--
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The meter is the length of the path travelled by light in vacuum
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during a time interval of 1/299 792 458 of a second.
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-->
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<base/>
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<name><singular>meter</singular></name>
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<symbol>m</symbol>
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<aliases> <name><singular>metre</singular></name> </aliases>
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</unit>
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<unit>
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<!-- The kilogram is the unit of mass; it is equal to the mass of the
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international prototype of the kilogram. -->
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<base/>
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<name><singular>kilogram</singular></name>
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<symbol>kg</symbol>
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</unit>
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<unit>
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<!--
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The second is the duration of 9 192 631 770 periods of the
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radiation corresponding to the transition between the two hyperfine
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levels of the ground state of the cesium 133 atom.
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-->
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<base/>
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<name><singular>second</singular></name>
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<symbol>s</symbol>
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</unit>
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<unit>
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<!--
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The ampere is that constant current which, if maintained in two
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straight parallel conductors of infinite length, of negligible
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circular cross-section, and placed 1 meter apart in vacuum, would
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produce between these conductors a force equal to 2e-7 newton
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per meter of length.
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-->
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<base/>
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<name><singular>ampere</singular></name>
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<symbol>A</symbol>
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</unit>
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<unit>
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<!--
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The kelvin, unit of thermodynamic temperature, is the fraction
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1/273.16 of the thermodynamic temperature of the triple point of
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water.
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-->
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<base/>
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<name><singular>kelvin</singular></name>
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<symbol>K</symbol>
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</unit>
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<unit>
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<!--
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1. The mole is the amount of substance of a system which contains
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as many elementary entities as there are atoms in 0.012 kilogram of
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carbon 12.
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2. When the mole is used, the elementary entities must be specified
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and may be atoms, molecules, ions, electrons, other particles, or
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specified groups of such particles.
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-->
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<base/>
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<name><singular>mole</singular></name>
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<symbol>mol</symbol>
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</unit>
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<unit>
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<!--
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The candela is the luminous intensity, in a given direction, of a
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source that emits monochromatic radiation of frequency 540e12
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hertz and that has a radiant intensity in that direction of 1/683
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watt per steradian.
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-->
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<base/>
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<name><singular>candela</singular></name>
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<symbol>cd</symbol>
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</unit>
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</unit-system>
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