n-ヘキサンおよびn-オクタンの表面張力の測定

抄録

The surface tension of two alkanes, namely n-hexane(C₆H₁₄), are investigated for temperatures from 273 K to 463 K in the present study. Under the coexistence of the sample liquid with its saturated vapor in equilibrium, the surface tension has been measured by the capillary rise method. At the same experimental condition, two sets of surface tension data have been independently obtained with two different Pyrex glass capillaries I and II whose inner radii are 0.1516±0.0004 and 0.1703±0.0005 mm, respectively. The purities of samples are not less than 97 % for n-hexane and 99 % for n-octane. The accuracy of surface tension measurements is estimated better than ±0.20 mN/m. The temperature dependence of the present results has been represented by van der Waals-type correlation with a standard deviation of 0.14 mN/m for n-hexane and 0.12 mN/m for n-octane, respectively. The uncertainty of the present correlations is estimated to be ±0.2 mN/m.