AbstractStatic permittivities (ϵ), excess enthalpies (HE), and excess volumes (VE) of Cyclohexane or Benzene + 1,2‐Dibromoethane, and the densities and refractive indices of the pure components, at 288.15, 298.15, 308.15 and 308.15 K, were measured. The dielectric measurements allowed the study of the conformational equilibrium and the calculation of the equilibrium constant and the conformational enthalpy. We have found thatHEis practically independent ofTin the range studied by us, and an explanation of this result is proposed. The influence of the temperature onVEis small and negative.HEandVEdata were correlated in terms of Flory‐Patterson's th