185 1 year, Thomson published a paper entitled "Thermodynamic Theory" and wrote down Thomson's expression of the second law of thermodynamics: it is impossible for us to obtain heat from a single heat source and make it completely useful without other influences. Although modern physics has corrected many mistakes in classical physics theory, the law of thermodynamics is still a correct and universal macro-physical law. He asserted from the second law of thermodynamics that energy dissipation is a universal trend. In the same year, william thomson established the absolute temperature scale by using Carnot cycle, and reset the melting point and boiling point of water to 273.7 degrees and 373.7 degrees respectively. To commemorate his contribution, the unit of absolute temperature is named Kelvn (K).