Steam Boilers, Engines, Nozzles and Turbines
In an impulse turbine

The steam is expanded in nozzles only and there is a pressure drop and heat drop
The steam is expanded both in fixed and moving blades continuously
The pressure and temperature of steam remains constant
The steam is expanded in moving blades only

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Steam Boilers, Engines, Nozzles and Turbines
In a reaction turbine

The expansion of steam takes place partly in the fixed blades and partly in the moving blades
The steam is expanded from a high pressure to a condenser pressure in one or more nozzles
The pressure and temperature of steam remains constant
The steam is allowed to expand in the nozzle, where it gives a high velocity before it enters the moving blades

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

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
Melting point rises slightly and boiling point drops markedly

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