s well as providing fine control over simplifying to derived units.
Dimensional analysis is possible, and a variety of tools are available to
manage conversion and simplification options.  In addition to customizable
automatic conversion, <em>units</em> also provides a traditional manual
conversion option.
</p>
<p>Note - when unit conversions are inexact Maxima will make approximations
resulting in fractions.  This is a consequence of the techniques used to
simplify units.  The messages warning of this type