Specific volume of the superheated steam:
It is volume occupied by unit mass of superheated steam corresponding to given pressure of superheated steam generation. Superheated steam acts like a perfect gas. Therefore the law
is applicable to superheated steam. Let
v_{g} = specific volume of dry saturated steam corresponding to given pressure of steam generation is m^{3} /kg.
T_{S } = absolute saturation temperature corresponding to given pressure of steam generation.
T_{sup} = absolute temperature of the superheated steam
P = pressure of steam generation
V_{sup} = the required specific volume of superheated steam. Then, in above formula,