Engineering Thermodynamics
The compression ratio is the ratio of

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

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Engineering Thermodynamics
An open system is one in which

Neither mass nor energy crosses the boundaries of the system
Both energy and mass cross the boundaries of the system
Mass crosses the boundary but not the energy
Mass does not cross boundaries of the system, though energy may do so

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