Or rather, why is it called displacement?
In: Engineering
The volume of an engines cylinder consists of
* The volume that is swept by the piston going up and down
* The unswept volume above where the piston stops, ie the combustion chamber.
The ratio of volume between the total volume and unswept volumes gives the (static) compression ratio. An example would be 1:10 for a petrol engine.
Displacement only refers to the swept volume. ie the volume of air+fuel mixture that is displaced by the piston.
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