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The vapor of an aqueous solution under its own vapor pressure in a closed system approximates the behavior of an ideal gas. Such a system is constantly in equilibrium, capable of rapid reversible adjustments to variation in temperature, pressure, and concentration. A satisfactory static vapor pressure apparatus is very desirable for the calculation of thermodynamic functions in the study of solutions. Hitherto the use of this method has been limited by the difficulties involved in the preparation of experimental solutions which were sufficiently free from residual gases 1 This paper constitutes a portion of a thesis submitted by the author to the Graduate Division of the University of California in partial fulfillment of the requirements for the degree of Doctor of Philosophy, December, 1937.

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