Question

Who came up with the second law of thermodynamics?

Answer 1

1. Both the first and second laws of thermodynamics were established by Rudolf Clausius and William Thomson (Kelvin) in the year $1850$.
2. The second law of thermodynamics as stated by Kelvin Planck: It is not possible to build a heat engine that, when put through a cycle, does nothing except absorb heat from a body and perform an equal amount of labour.
3. The second law of thermodynamics as stated by Clausius: It is difficult to build a machine that runs in a cycle and produces nothing but a constant flow of heat from one body to another at a greater temperature.