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Water-Steam Mollier Diagram

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

Download and print Mollier Diagram for Water - Steam

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

See also Water - Enthalpy (H) and Entropy (S) for figures and tabulated values at varying temperatures

Dryness Fraction

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

dryness fraction , or quality,

of the vapor.

Convert to other Units

  • 1 bar = 10 5 Pa (N/m2) = 0.1 N/mm2= 10,197 kp/m2= 10.20 m H2O = 0.9869 atm = 14.50 psi (lb f /in2) = 10 6 dyn/cm2= 750 mmHg
  • 1 kJ/kg = 0.4299 Btu/ lb m = 0.23884 kcal/kg

Example - Enthalpy

The enthalpy in saturated steam ( x = 1, the bold red line in the diagram) with pressure 10 bar can be estimated to aprox.

2770 kJ/kg

The value can be verified by using the steam table .

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