Surface tension prediction for pure fluids

In this paper we propose the following expression for surface tension of organic compounds: σ = [P . (ρ l - ρ v )] 4 where P = P o . (1-Tr) 0.37. Tr . Exp(0.30066/Tr + 0.86442 . Tr9) In this equation ρl and ρv are the molar densities of liquid and vapor, respectively, Tr=T/Tc, Po is a temperature-independent compound-dependent constant similar to the Sugden's parachor. This new expression, originally derived from the statistical-mechanics is shown to represent the experimental surface tension data of 94 different organic compounds within 1.05 AAD%. We also propose P o = 39.6431.[0.22217 - 2.91042 x 10-3.(R*/Tbr2)].Tc13/12 /Pc5/6

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