quantities
A library for creating and manipulating physical
quantities, which are a numerical value
associated with a unit of measurement. Included
is an expression parser and a huge list of
predefined quantities with which to parse
strings into a Quantity datatype. Once created,
a quantity can be converted to different units
or queried for its dimensionality. A user can
also operate on quantities arithmetically, and
doing so uses automatic unit conversion and
simplifcation.
