Abstract
The surface tension of aqueous terpene solutions was measured by the maximum bubble pressure method. The results obtained were as follows:(1) The surface tension of aqueous terpene solutions was varied by Szyszkowski's equation and the constants in the equation were determined.(2) The decrease in surface tension of aliphatic terpenes was greater than that of monocyclic or bicyclic terpenes.(3) Providing that the surface tension of the component aqueous solution varies inaccordance with Szyszkowski's equation and that there are no mutual interferences among the componetns of the mixture, the theoretical expression of the relationship between the surface tension of the mixed solution and the concentration of the solute was proposed as follows:γ=γ0IIi {-Cilog (1+ci/ai)} where γ0 and γ denote the surface tension of water and of the mixed solution, ci is the concentration of the solute, and Ci and ai are constants found in Szyszkowski's equation.(4) It was shown that the surface tension measured on the mixture of the terpene solutions was in satisfactory agreement with that calculated from the above equation.
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