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The observed linear thermal expansion of crystalline sodium is tabulated at ten degree intervals between 80^∘{}K and 290^∘{}K. The behavior of this material is in accord with the relation obtained by Gruneisen between thermal expansion and heat content, within the precision measure of the latter quantity. A description of the thermal expansion and cryostatic apparatus is given.
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Siegel et al. (1938) studied this question.
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