Comment on thermodynamics of rubber elasticity.
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The elastic recovery of rubber is due to its tendency to maximize the entropy. ... Metallic materials possess energy elasticity, while ideal rubber possesses entropy elasticity. The thermodynamic behaviour of rubber is similar to that of gaseous materials. Hence rubber can be used as an aid for teaching thermodynamics.
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Rubber magnets are molded by mixing rubber with ferrite powder. The absorption power is substantially weaker than anisotropic ferrite magnets, but machining can be performed easily after purchasing these products, as they can be cut with a pair of scissors or cutters.
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