8.1 surface tension 1.5 Influential Factors on surface tension vapor vapor 30 Liquid Liquid q 20 Supercritical fluid The empirical equation proposed by Eotvos and modified by ramsay and shields 100 200 an23=k(T。-T-60) Surface tension decreases with increasing Vm is the molar volume of the liquid, k is a temperature. At critical temperature(To, proportional factor, for non-polar liquid, surface tension equals 0. equals22×107JK1Surface tension decreases with increasing temperature. At critical temperature (Tc ), surface tension equals 0. Liquid vapor Liquid Supercritical fluid vapor 1.5 Influential Factors on surface tension The empirical equation proposed by Eotvos and modified by Ramsay and Shields : ( 6.0) 2 / 3 Vm = k Tc −T − Vm is the molar volume of the liquid, k is a proportional factor, for non-polar liquid, equals 2.2  10-7 J K-1 . 8.1 surface tension