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

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

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