PPT Slide

H. Poincaré [1] wrote that the electromagnetic energy can bedescribed as "un fluide fictif", with mass equal the ratio of energyto the square of the speed of light.

[1] POINCARE' H. 1900, "La théorie de Lorentz et le principe deréaction", in Recueil de travaux offerts par les auteurs à H. A. Lorentz,L'Aia, Nijhoff, pp. 252-78.

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