\begin{definition}[Definition:Gram]
The '''gram''' is the CGS base unit of mass.
It is defined as the mass of a cubic centimetre water at the temperature of melting ice.
{{begin-eqn}}
{{eqn | o = 
      | r = 1
      | c = '''gram'''
}}
{{eqn | r = 10^{-3}
      | c = kilogram
}}
{{end-eqn}}
\end{definition}