Abstract
USING the method of Alty1, we have measured the coefficients of condensation (f) of the compounds mercuric chloride, bromide and iodide. A hemispherical cap of these salts was deposited by sublimation on the end of a glass tube which could be heated internally by boiling turpentine. The temperature of the cap surface was measured by a fine thermocouple while the salt evaporated in a high vacuum. The quantity of salt evaporated per unit time and area (M1) was determined by weighing the deposit on a surrounding glass tube immersed in liquid air. By calculating the maximum rate of evaporation (M2) from the formula of the kinetic theory of gases, where P is saturated vapour pressure (mm. mercury), M is molecular weight, t is time of evaporation, T is absolute temperature, one finds f = M1/M2.
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References
Alty, Proc. Roy. Soc., A, 161, 68 (1937).
Kelley, Bull, 383, U.S. Dep. of the Interior, Bureau of Mines, Washington (1935).
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METZGER, F., MIESCHER, E. Condensation Coefficients of Mercury Halides. Nature 142, 572 (1938). https://doi.org/10.1038/142572b0
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DOI: https://doi.org/10.1038/142572b0
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