We know that if we brought a body at temperature T' in contact with a heat reservoir at temperature T (where T' < T) entropy of the universe increases.(adsbygoogle = window.adsbygoogle || []).push({});

What if we brought a body at temperature T' in contact with a reservoir at temperature T ( where T' > T)?

It is supposed also that the entropy of the universe increases.

But when am trying to proof it mathematically, I fall into another question: in the first case, the temperature of the heat reservoir remains the same, it is a reservoir after all, but in the second case, does the temperature of the body stay the same? Or it decreases by a certain amount. And the heat reservoir in the second case, does it temperature increases? Or since it is a heat reservoir, it should change the temperature of the body and not vice versa. I should have some misconception going on.

Do you have any idea?

Thanks in advance.

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# Entropy of the universe increases..

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