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.

References

• 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.