8.1 surface tension 1.5 Influential Factors on surface tension dG=-SdT +dp +odA+2uBdr (I)temperature dependence of surface tension T/oC HO CH CHOH CHOH T, P, nB aT A, P, nB 07564316 29.5 24.0 TaS 25719428227.1 21.8 26198 (OT) AP 50679125.0 7063.521.9 22.0 TaS aA ,er>o Is the heat adsorbed by unit area enlargement Surface tension decreases with Adiabatic expansion of OT)AP,mB increasing the surface area will result <0 temperature in temperature decrease APn1.5 Influential Factors on surface tension 0 , ,          A P nB T  Surface tension decreases with increasing the temperature. (1) temperature dependence of surface tension T / oC H2O C6H6 CH3OH C2H5OH 0 75.64 31.6 29.5 24.0 25 71.94 28.2 27.1 21.8 50 67.91 25.0 24.6 19.8 70 63.5 21.9 22.0 T P nB A P nB A T S , , , ,          = −         B B T P n T A P n T A T S , , , ,          = −         0 , ,          T P nB A T S is the heat adsorbed by unit area enlargement. Adiabatic expansion of surface area will result in temperature decrease. 0 , ,          A P nB T  8.1 surface tension B B B dG S T V p dA n = + + + - d d d   