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An enthalpy–entropy chart, also known as the H–S chart or Mollier diagram, plots the total heat against entropy, describing the enthalpy of a thermodynamic system. A typical chart covers a pressure range of 0.01–1000 bar, and temperatures up to 800 degrees Celsius. It shows enthalpy H {\displaystyle H} in terms of internal energy U {\displaystyle U} , pressure p {\displaystyle p} and volume V {\displaystyle V} using the relationship H = U + p V {\displaystyle H=U+pV\,\!} .
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