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

Melting point drops slightly and boiling point drops markedly
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

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Steam Boilers, Engines, Nozzles and Turbines
When the inlet pressure of steam is equal to the exit pressure, then

There is no pressure drop and fluid does not flow through the nozzle
Fluid flows through the nozzle
Pressure drops and fluid flows through the nozzle
There is a pressure drop in the nozzle

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