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adding text on Planck
{{cquote|The equality of the mass equivalent of radiation to the mass lost by a radiating body is derivable from Poincaré’s momentum of radiation (1900) and his principle of relativity (1904).|||[[Herbert Ives]], 1952}}
{{cquote|The equality of the mass equivalent of radiation to the mass lost by a radiating body is derivable from Poincaré’s momentum of radiation (1900) and his principle of relativity (1904).|||[[Herbert Ives]], 1952}}
In 1907, [[Max Planck]] proved in his fundamental paper that the formula ''E=mc²'' is not a general law and any system submitted to an external pressure will obey a different law: its mass will be proportional to its enthalpy ''H=E+PV'', that is, ''m=H/c²''<ref name="Capria">{{cite book |author=Marco M. Capria, Aubert Daigneaut et al. |title=Physics Before and After Einstein |publisher=IOS Press |year=2005 |chapter=2.Mechanics and Electromagnetism... |pages=43|isbn=1-58603-462-6 |url=http://www.dmi.unipg.it/~mamone/pubb/PBAE.pdf |quote=}}</ref>.
== Description for the layman ==
== Description for the layman ==