Internal Combustion Engines
As a result of detonation in an I.C. engine, following parameter attains very high value

Peak temperature
Peak pressure
Rate of rise of pressure
Rate of rise of temperature

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

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

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