Article | REF: BE8041 V2

Thermodynamic charts - pure substances, azeotropes and ideal gases

Author: Renaud GICQUEL

Publication date: October 10, 2015, Review date: September 10, 2021

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1. Thermodynamic diagrams

1.1 Coordinate systems

Among the many possible coordinate systems, we'll focus on six:

  • the Clapeyron diagram (P, v ), which gives the most direct picture of mechanical transformations, but is not very useful for studying industrial projects, as it does not allow the usual energy quantities, particularly entropy and enthalpy, to be read accurately;

  • the entropy diagram (T, s ) which directly visualizes reversible heat transfers

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Thermodynamic diagrams