Consider the thermodynamic description of stretching rubber. The observables are the
Chapter 19, Problem 19.20(choose chapter or problem)
Consider the thermodynamic description of stretching rubber. The observables are the tension, t, and length, l (the analogues of p and V for gases). Because dw = tdl, the basic equation is dU = TdS + tdl. (The term pdV is supposed negligible throughout.) If G = U TS tl, find expressions for dG and dA, and deduce the Maxwell relations T = l T = t Go on to deduce the equation of state for rubber, T = t l
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