On quantity calculus and units of measurement
Abstract
'Quantity calculus' is a name sometimes given to algebra as it is applied to quantities. It is assumed that the rules of algebra apply equally well to quantities as they do to numbers, and that they apply to units of measurement because they too are, by definition, quantities in their own right. This paper examines that assumption and concludes that, while it may be true of abstract quantities, it is not universally applicable to measurable quantities, whose practical units are not algebraic variables.
 Publication:

Metrologia
 Pub Date:
 April 2008
 DOI:
 10.1088/00261394/45/2/002
 Bibcode:
 2008Metro..45..134E