Accroissement d'energie interne et de densite d'energie interne d'un milieu dielectrique polarise

For an isotropic dielectric medium, having an arbitrary shape and a stationary polarization, the polarization-induced increase of internal energy of the dielectric only is reexamined from Güntelberg's thermodynamic point of view. The value obtained for this increase is quite different from what was previously admitted, even in the case of dielectrics with simple shapes. The new value is in better agreement with earlier results. It is furthermore well in accord with the exact macroscopic relation between the internal energy and a density of internal energy, a relation which is more intricate than the simple relation of integration largely accepted up to now.