By means of radioactive 85Kr the solubility of krypton in liquid lead and liquid tin has been measured. In the temperature range 800°c to 1300°c for lead and 1100°c to 1300°c for tin the Ostwald coefficient r (volume of gas dissolved in unit volume of metal) varies with temperature according to the empirical relation and the thermodynamic equation where 1/a 3 is the number of metal atoms in unit volume, m the mass of a. krypton atom, H is the energy needed to transfer an atom at rest in the gas into solution in the metal, and S the vibrational entropy of a krypton atom dissolved in the liquid metal. Experimental results are given in the table. The values of H are approximately equal to the surface area of a krypton atom multiplied by the surface energy of the liquid metal, and the vibrational entropies of the gas atoms are less than those of the metal atoms corresponding to a greater vibrational frequency. No solubility was detected in liquid silver showing that r10−7, i.e. when krypton pressure is one atmosphere the atomic fraction dissolved is less than 10−11.
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Johnson et al. (1959) studied this question.
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