Steam Boilers, Engines, Nozzles and Turbines
The actual vacuum in a condenser is equal to

Barometric pressure - actual pressure
Barometric pressure + actual pressure
Gauge pressure + atmospheric pressure
Gauge pressure - atmospheric pressure

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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 slightly
Melting point drops slightly and boiling point drops markedly

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