Abstract
Universal relations between the saturation pressure p LV and the value of ϕ=Δh LV/Δν LV−p LV, where Δh LV .is the latent heat of evaporation and Δν LV is the volume change of the vapor-liquid transition, and the product of the orthobaric densities ρ L and ρ V of the liquid and vapor at coexistence have been discovered. In the temperature range from the triple point to T/T c≈0.9, these relations obey a power law with universal exponents. At temperatures 0.9<T/T c≤1, p LV and ϕ depend linearly on ln(ρ L ρ V) with retention of universality for substances of different nature.
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