\begin{definition}[Definition:Litre]
The '''litre''' is an SI unit of volume.
It is defined as:
{{begin-eqn}}
{{eqn | o = 
      | r = 1
      | c = '''litre'''
}}
{{eqn | r = 1000
      | c = cubic centimetres
}}
{{eqn | r = 10^{-3}
      | c = cubic metres
}}
{{end-eqn}}
\end{definition}