\begin{definition}[Definition:Imperial/Volume/Cubic Inch]
The '''cubic inch''' is an imperial unit of volume.
:$1$ '''cubic inch''' $= 16 \cdotp 38706 \, 4$ cubic centimetres $= 0 \cdotp 01638 \, 7064$ litres.
This definition is exact, and is derived from the definition of the imperial unit of length as $2 \cdotp 54$ centimetres.
\end{definition}