Steam Boilers, Engines, Nozzles and Turbines
Expansion ratio is the ratio of

Swept volume to the clearance volume
Volume at cut-off to the swept volume
Swept volume to the volume at cut-off
Clearance volume to the swept volume

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Steam Boilers, Engines, Nozzles and Turbines
For water, at pressures below atmospheric;

Melting point rises slightly and boiling point drops markedly
Melting point rises markedly and boiling point drops markedly
Melting point drops slightly and boiling point drops markedly
Melting point drops slightly and boiling point drops slightly

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