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The volume of vapour evolved from liquid helium by known amounts of heat has been measured at temperatures between 2·9 and 4·5° k. The derivation of latent heat values from these results is discussed, and it is shown that the existing experimentally determined values of the saturated vapour density are not sufficiently reliable for this purpose. The probable true values of the vapour density are considered.
Berman et al. (1952) studied this question.