Neumann's law states that the molecular heat in compounds of analogous constitution is always the same.L.F. Nilson and O. Pettersson, "On the molecular heat and volume of the rare earths and their sulphates," Proceedings of the Royal Society of London, Vol. 31, pp. 46–51, 1880–81. It is named after German mineralogist and physicist Franz Ernst Neumann, who extended the law of the heat of elements by stating that the molecular heat is equal to the sum of the heat of each constituent atom.
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