--- loncom/html/adm/help/tex/Physical_Units.tex	2006/11/20 20:38:08	1.5
+++ loncom/html/adm/help/tex/Physical_Units.tex	2011/06/08 20:29:09	1.7
@@ -120,10 +120,18 @@ gray            Gy     # absorbed dose (
 sievert         Sv     # dose equivalent (dose equivalent index)
 astroUnit       AU     # mean distance earth to sun
 celcius         degC   # multiplicatively OK
-farenheight     degF   # multiplicatively OK
+fahrenheit	degF   # multiplicatively OK
 molarity        M      # chemisty
 amu             amu    # atomic mass unit
 amu             u      # atomic mass unit
+lightspeed      c      # speed of light
+cubiccentimeter cc     # cubic centimeter
+electroncharge  e      # elementary charge
+hbar            hbar   # Planck constant
+milesperhour    mph    # miles per hour
+rpm             rpm    # rounds per minute
+rpm             rpms   # rounds per minute
+parsec          pc     # parsec
 \end{verbatim}
 \subsection*{Interpretation}
 The coded units are interpreted in the order of basic unit,