# Mollier Diagram for Water-Steam

## Enthalpy-entropy diagram for water and 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 vapor* in unit mass of *wet vapor*, denoted by* x*, is referred to as the

dryness fraction,orquality,

of the vapor.

### Convert to other Units

*1 bar = 10*^{5}Pa (N/m^{2}) = 0.1 N/mm^{2}= 10,197 kp/m^{2}= 10.20 m H_{2}O = 0.9869 atm = 14.50 psi (lb_{f}/in^{2}) = 10^{6}dyn/cm^{2}= 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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