Steam Boilers, Engines, Nozzles and Turbines
Water boils when its vapor pressure

Equals that of the surroundings
Equals to atmospheric pressure
Equals the pressure of water in the container
Equals 760 mm of mercury

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Steam Boilers, Engines, Nozzles and Turbines
The power of a boiler may be defined as

The ratio of heat actually used in producing the steam to the heat liberated in the furnace
The evaporation of 15.653 kg of water per hour from and at 100° C
The amount of water evaporated from and at 100° C into dry and saturated steam
The amount of water evaporated or steam produced in kg per kg of fuel burnt

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