A cryostat and equilibrium vessel together with auxiliary apparatus for establishing equilibrium between liquid and vapor phases of solutions of low boiling material by a circulation method is described. The equilibrium vessel incorporates a novel liquid sampling device. Vapor and liquid compositions and total vapor pressures of solutions of oxygen and nitrogen were measured along isotherms at 77.5[degrees], 70[degrees] and 65[degrees]K. The activity coefficients of nitrogen and oxygen may be represented by equations of the form [...] cal/cm^ mole has the values 1.22 at 77.5[degrees], 1.38 at 70[degrees] and 1.47 at 65[degrees]K. The deviations of the solutions from ideality are much less than is to be expected of regular solutions, in which the interaction energy between unlike molecules follows a geometric mean law. The data are not entirely consistent with the assumption that molar volumes are additive in the solutions. In an appendix a study of the vapor pressure of nitrogen is described.
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Chicago
National Institute of Standards and Technology (NIST), Commerce Department. "Liquid-Vapor Phase Equilibrium in Solutions of Oxygen and Nitrogen at Pressures Below One Atmosphere". Government. Commerce Department, January 31, 1955. https://www.govinfo.gov/app/details/GOVPUB-C13-f6529e1cb81e163837f82a264969284a
APA
National Institute of Standards and Technology (NIST), Commerce Department. (1955, January 31). Liquid-Vapor Phase Equilibrium in Solutions of Oxygen and Nitrogen at Pressures Below One Atmosphere. [Government]. Commerce Department. https://www.govinfo.gov/app/details/GOVPUB-C13-f6529e1cb81e163837f82a264969284a
MLA
National Institute of Standards and Technology (NIST), Commerce Department. Liquid-Vapor Phase Equilibrium in Solutions of Oxygen and Nitrogen at Pressures Below One Atmosphere. Commerce Department, (31 Jan 1955), https://www.govinfo.gov/app/details/GOVPUB-C13-f6529e1cb81e163837f82a264969284a
Bluebook
National Institute of Standards and Technology (NIST), Commerce Department, Liquid-Vapor Phase Equilibrium in Solutions of Oxygen and Nitrogen at Pressures Below One Atmosphere, GovInfo, (January 31, 1955), https://www.govinfo.gov/app/details/GOVPUB-C13-f6529e1cb81e163837f82a264969284a
