18. Combine the 1st and 2nd laws of thermodynamics for a PVT system so as to show that, for any infinitesimal reversible process, T ds = dU + P dV. OR Show (by combining the 1st and 2nd laws of Thermodynamics for a PVT system) that, for any infinitesimal reversible process, T ds = dU+ P dV.
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