\begin{definition}[Definition:Imperial/Volume/Chopin]
The '''chopin''' is an imperial unit of volume.
{{begin-eqn}}
{{eqn | o = 
      | r = 1
      | c = '''chopin'''
}}
{{eqn | r = 2
      | c = gills
}}
{{eqn | r = 0 \cdotp 28413 \, 0625
      | c = litres
}}
{{eqn | r = 284 \cdotp 13062 \, 5
      | c = millilitres
}}
{{end-eqn}}
\end{definition}