--- loncom/html/adm/help/tex/Physical_Units.tex	2011/12/02 17:42:01	1.8
+++ loncom/html/adm/help/tex/Physical_Units.tex	2011/12/02 18:04:11	1.9
@@ -3,8 +3,8 @@
 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''.
+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.