Abstract
A new theoretical expression of the density fluctuation of the refractive index (dn 2 /dd) p or DFRI has been deduced from a general expression of the Lorentz-Lorenz equation and from the calculation of the partial derivatives of n 2 . The square of the refractive index in each point of the liquid has been considered as a function of the number N of molecules per volume unit, of the temperature T and of the pressure P
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