Internal Combustion Engines
Compression ratio of I.C. Engines is

Volume displaced by piston per stroke and clearance volume in cylinder
Swept volume/cylinder volume
Ratio of pressure after compression and before compression
The ratio of volumes of air in cylinder before compression stroke and after compression stroke

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Internal Combustion Engines
Supercharging is the process of

Providing forced cooling air
Supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere
Injecting excess fuel for raising more loads
Supplying compressed air to remove combustion products fully

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