It is shown that the internal energy and entropy changes which take place when rubber is stretched may be determined either by a study of the variation of tension with temperature or by measurement of the heat evolved. The results obtained by a number of authors using both methods are considered. Although quantitative accuracy is not found, the evidence substantiates the kinetic-statistic explanation of rubber elasticity. Crystallization, though giving rise to important thermal effects, is not essentially connected with the phenomenon of elasticity.

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