Mollier Diagram for Water-Steam

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The diagram below can be used to determine enthalpy versus entropy of water and steam.

The Mollier diagram is useful when analyzing the performance of adiabatic steady-flow processes, such as flow in nozzles, diffusers, turbines and compressors. 

Dryness Fraction

The quantity of saturated vapour in unit mass of wet vapour, denoted by x, is referred to as the

dryness fraction, or quality,

of the vapour. 

Convert to other Units

• 1 bar = 10⁵ Pa (N/m²) = 0.1 N/mm² = 10,197 kp/m² = 10.20 m H₂O = 0.9869 atm = 14.50 psi (lb_f/in²) = 10⁶ dyn/cm² = 750 mmHg
• 1 kJ/kg = 0.4299 Btu/ lb_m = 0.23884 kcal/kg

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