The subject has been recently treated by the author in a paper published in French in the Bull. soc. chim. Belges 66, 476 (1957). That paper has now been trans lated, revised, and completed for the présent publication. ^ A similar evaporation phenomenon créâtes tears on the walls of a glass contain ing a strongly alcoholic liquor. Merigoux (2) reminds us that this phenomenon is known by the name of "James Thomson's pearls" or by the name of "vin capi teux des Hébreux". Solomon said therefore: "Do not drink wine if it is red and if it comes up by itself in the cup" (3).
SUMMARYEvaporation of solute in aqueous solutions of long chain alcohols and acids may cause important errors in measures of the surface tensions of these solutions.The work described in the present paper has shown that, cven in a closed vessel, the vapour pressure of the solute is not uniform and particularly with the pendant drop method, the heavy vapours do not remain near the drop, where the surface tension is measured.The du Nouy ring method and the pendant drop method have been improved to avoid evaporation.Various anomalies, found in the literature, have been shown to be due to evaporation, especially the (
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