S 23 {\displaystyle C_{V}} 10 An example of a system which does not have a unique ground state is one whose net spin is a half-integer, for which time-reversal symmetry gives two degenerate ground states. (1971). This residual entropy disappears when the kinetic barriers to transitioning to one ground state are overcome.. K The temperature of the closed system rises by: T {\displaystyle 00. The entropy of a perfect crystal of an element in its most stable form tends to zero as the temperature approaches absolute zero . 1. S qsys 0. qrxn - (qwater qbomb) qwater msDT. A single atom was assumed to absorb the photon but the temperature and entropy change characterizes the entire system. Third Law of Thermodynamics Third law of thermodynamics states that the entropy of a system approaches a constant value as the temperature approaches absolute zero. For any solid, let S0 be the entropy at 0 K and S be the entropy at T K, then, ΔS = S – S0 = $$\int^T_0 \frac {C_p dT}{T}$$. 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