Neumann's law states that the molecular heat in compounds of analogous constitution is always the same. It is named after German mineralogist and physicist Franz Ernst Neumann.

This article relies largely or entirely on a single source. (April 2024)

• 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.

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