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-version 1.2, 2005/06/06 22:21:39
+version 1.3, 2006/09/07 21:25:51
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  \section*{Physical Units Accepted by LON-CAPA}
  The following subsections show the physical units that LON-CAPA accepts.
  The symbols must be used when entering the units, for example {}``35 kg''.
+ Note that compound units are formed by using *, / and ^. For example, an acceleration might
+ be in terms of ``m/s^2'' or meters per second squared. This could also be expressed as``m/s/s''.
+ Units of Newton-meters (for torque) would be entered as ``N*m''. Parentheses may be used to guarantee
+ the correct sense of the unit. Kilometers per Ampere-hour could be written as ``km/(A*hr)'' or
+ ``km/A/hr'' but not ``km/A*hr''. The last option would be interpreted as kilometer times hours per Ampere.
+ LON-CAPA will automatically perform some conversions between units of the same dimension
+ when units are provided for a problem.
+ You can provide an answer of ``1.45 km'' for a distance.
+  If the computer expects the answer in cm, it will convert your answer before comparing
+ against the numerical solution.
+ Please note that if your units are inappropriate, the computer has no way of checking
+ the appropriateness of your answer.  If units are required, only once appropriate
+ units are provided will the system check your numerical answer.
  \subsection*{Base Units}
  \begin{verbatim}
  # name      symbol     comment