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# Find the maximum possible $\mathrm{COP}$ for a freezer that maintains $-5^{\circ} \mathrm{C}$ when the surrounding room temperature is $25^{\circ} \mathrm{C}$.

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In this problem we need to find the maximum $COP$ of a freezer that maintains, $T_{\rm low} = -5~^\circ\rm C = 268~\rm K$, in an environment having room temperature $T_{\rm high} = 25~^\circ\rm C = 298~\rm K$.

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