In 1669, German physician and chemist

In 1703, Becher’s student Georg Stahl updated the terra pinguis model of with a phlogiston model of combustion. [2] This in turn gave way to the caloric theory by French chemist Antoine Lavoisier in circa 1780; which culminated in the mathematical entropy concept developed by German physicist Rudolf Clausius in 1865.

References

1. Partington, J.R. (1957).

2. Leicester, Henry M. and Klickstein, Herbert S. (1969).