Abstract
On the basis of the differential capillary rise method and the vertical plate method, two kinds of experimental apparatus for measuring the surface tension of CFC alternatives have been constructed. In order to confirm the performance of these experimental apparatus, measurements of the surface tension for CFC-12, HCFC-22 and CFC-113 have been made in the range of temperatures between 273 and 343 K. The uncertainty of temperature measurement for the differential capillary rise method is estimated within ±20mK, whereas that for the vertical plate method is estimated within ±30mK. As the results of the comparisons between the present work and other investigations, the uncertainties of these measurements are estimated within ±0.1mN/m with the apparatus for the differential capillary rise method and within ±0.2mN/m with that for the vertical plate method.
