The orthobaric surface tensions of the three binary mixtures formed by krypton, ethane and ethene

Abstract

The surface tensions of krypton–ethane and krypton–ethene mixtures have been determined as a function of composition from 116.0 to 124.0 K and for ethene–ethane mixtures from 117.0 to 135.0 K. In each case the deviations from mole-fraction linearity are negative, although least so for the mixture of hydrocarbons. The results have been analysed in terms of a number of theories that take no explicit account of the quadrupole nature of the hydrocarbons. Agreement with simple theories could be achieved by some empirical corrections of the Berthelot and Lorentz combining rules. However, the values of these differ significantly from those obtained with similar treatments applied to the bulk properties of these mixtures.