Surface fraction, Guggenheim

The surface tension of mixtures of water and ethyl alcohol at 25 C has been measured by Bircumshaw (J. Chem. Soc. 1922, 887). Partial vapour pressures of these laiixtures also at 25 C have been determined by Dobson (J. Chem. Soc. 1925, 2866). These values, smoothed in accordance with the requirements of the Duhem-Margules relation are given with related quantities at rounded mole fractions in table 1 (Guggenheim and Adam, Proc. Roy. Soc. A 1933, 139, 218). The subscript 1 relates to water and 2 to alcohol, x denotes mole fraction, p partial pressure, and y surface tension. 

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