In 1921 he was able to give a very precise definition of the quantity of heat and the most satisfactory mathematical statement of the law of thermodynamics. His most famous achievement came in 1926 when he collaborated with one of his students, [[Werner Heisenberg]] to develop a mathematical formulation that would describe Heisenberg’s first laws of the new quantum theory (matrix mechanics).
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In 1921 he was able to give a very precise definition of the quantity of heat and the most satisfactory mathematical statement of the law of [[thermodynamics]]. His most famous achievement came in 1926 when he collaborated with one of his students, [[Werner Heisenberg]] to develop a mathematical formulation that would describe Heisenberg’s first laws of the new quantum theory (matrix mechanics).