Question

How was the first law of thermodynamics discovered?

Answer 1

History of thermodynamics. ... Around 1850 Rudolf Clausius and William Thomson (Kelvin) stated both the First Law - that total energy is conserved - and the Second Law of Thermodynamics. The Second Law was originally formulated in terms of the fact that heat does not spontaneously flow from a colder body to a hotter.

this was how

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Answer 2

first law of thermodynamics was discovered by Rudolf Clausius and William Thomson in 1850
by conserving energy