A Sensitive Static Vapor Pressure Apparatus.

Abstract

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.

Nature of Bound Water in Colloidal Systems

“…The first consisted of vapor pressure measurements made by a highly sensitive static vapor pressure apparatus described in a previous paper (5). Gelatin was selected as a typical hydrophilic colloid upon which much data has been secured (3,16,20,21,22,23,29,32,35,42,46,50,58,65).…”

“…The gain or loss is due to changes in physical properties of the molecule. 5 Entropy: the energy, in calories per degree, absorbed in a process but not available for work. As used here positive values indicate a more random condition, negative values a less random condition of the molecules.…”

The Thermoelectric Method of Measuring Vapor Pressure.

“…Presented before the Division of Physical and Inorganic Chemistry at the 102nd Meeting of the American Chemical Society, held in Atlantic City, New Jersey, September 8-12, 1941 8. Former Fellow in Biophysics, Mayo Foundation, Rochester, Minnesota.…”