The Basics.
Volume of one unit mass of steam is thousand times that of water, When water is converted to steam in a closed vessel the pressure will increase. Boiler uses this principle to produce high pressure steam.
Conversion of Water to Steam evolves in three stages.
Heating the water from cold condition to boiling point or saturation temperature – sensible heat addition.
Water boils at saturation temperature to produce steam - Latent heat.addition.
Heating steam from saturation temperature to higher temperature called Superheating to increase the power plant output and efficiency.