Engineering Thermodynamics
The compression ratio is the ratio of

Total volume to swept volume
Total volume to clearance volume
Swept volume to total volume
Swept volume to clearance volume

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Engineering Thermodynamics
According to First law of thermodynamics,

Total energy of a system remains constant
Total internal energy of a system during a process remains constant
Work-done by a system is equal to the heat transferred by the system
Internal energy, enthalpy and entropy during a process remain constant

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