1038120.02541000022An Ontology for Units of MeasureUnits of Measure.
This ontology defines a set of properties which may be used
for reprenting physical quantities. Each is an RDF Property
which realtes a quantity to a number which expreses the quantity in
that expressed that quntity in the given unit.
:bed ex:length _:a.
_a: m 2.
Property chaining is the equivalent of unit multiplication.
Inverse properties correspond to reciprocal units.
Because conventional signs for units are very case-sensitive, this
ontology breaks from the normal convention that all property localnames
begin with lowercase.
See also http://www-ksl.stanford.edu/knowledge-sharing/papers/engmath.html
$Id: unit.rdf,v 1.2 2007/07/31 23:06:23 timbl Exp $The number Ampêres in this current.The number of Coulonbs in this electyric charge.The number of joules in this energy.The number of Newtons in this force.A (scalar) physical quanity or dimensionless number.
(This could be extended to include vector quantities.)Unit of measure. Units of measure are commutative
with each other under o2:chain. The number of Volts in this electrical potential.The number of Watts in this power.The number of Hertz in this frequency.The number of kilograms in this mass.The number of meters in this linear measurement.The number of square meters in this area.The number of meters per second in this speed.The number of meters per second per second in this acceleration.The product of units of measure and numbers.The number of seconds in this time measurement.