Richard Mollier (1863–1935) was a notable German engineer and physicist, best known for his contributions to the field of thermodynamics, particularly in the study of psychrometrics and the behavior of moist air. He developed the "Mollier diagram," also known as the enthalpy-entropy diagram, which graphically represents the relationships between various thermodynamic properties of moist air, such as temperature, humidity, enthalpy, and entropy.
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