Mollier Diagram for Water-Steam

Enthalpy-entropy diagram for water and steam

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

mollier diagram water

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, or quality,

of the vapor. 

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 (lbf/in2) = 106 dyn/cm2 = 750 mmHg
  • 1 kJ/kg = 0.4299 Btu/ lbm = 0.23884 kcal/kg

Related Topics

Related Documents

  • Properties of Saturated Steam - SI Units - A Saturated Steam Table with steam properties as specific volume, density, specific enthalpy and specific entropy
  • Enthalpy of Wet Steam - Wet steam, dryness fraction and enthalpy
  • 1st Law of Thermodynamics - The First Law of Thermodynamics simply states that energy can be neither created nor destroyed (conservation of energy). Thus power generation processes and energy sources actually involve conversion of energy from one form to another, rather than creation of energy from nothing
  • Steam and Vapor Enthalpy - Introduction and definition of vapor and steam enthalpy - specific enthalpy of saturated liquid, saturated vapor and superheated vapor
  • 2nd Law of Thermodynamics - The second law is concerned with entropy, which is a measure of disorder. The second law says that the entropy of the universe increases
  • Water - Thermal Properties - Thermal properties of water - density, freezing temperature, boiling temperature, latent heat of melting, latent heat of evaporation, critical temperature and more

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