When You Release A Stetched Rubber Band, Why Does It Change Temperature?

When you stretch a rubber band, the volume and entropy decrease, and the temperature rises, whereas when you allow a rubber band to relax, the volume and entropy increase, so the temperature falls. 
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When You Release A Stetched Rubber Band, Why Does It Change Temperature?

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Solved For a rubber band, the internal energy (u) is a

thermodynamics - Why do some sources say that Rubber bands become stretchier when heated? - Physics Stack Exchange

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