Tweet First of all, a quick introduction to 4 the most important figures in thermodynamics: Sadi Carnot (1796-1832) who discovered the second law of thermodynamics. Rudolf Clausius (1822-1888) who restated the Sadi Carnot’s principle into the form we use today. William Thomson (Lord Kelvin, 1824-1907) who brought thermodynamics into its modern form. Max Planck (1858-1947) … Continue reading Macroscopic Thermodynamics