| http://www.w3.org/ns/prov#value | - It was Joule who during the period 1840-1849 performed experiments and established that heat is a form of energy and laid the foundation for the first law of thermodynamics.<br />First law for a closed system undergoing a change of state or mathematical equation for first law of thermodynamics<br />Go, thru section 4.2, page 71 of ???Engineering Thermodynamics???, fourth Edition, by P. K. Nag.<br
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