Abstract

A QUANTITY of heat Q is transferred by radiation from a body the surface of which is at temperature T1 to a body the surface of which is at a lower temperature T2. From this cause alone the former body loses a quantity of entropy Q/T1, while the latter gains a quantity of entropy Q/T2. The net gain of entropy of the bodies arising from the transaction is Q(i/T2_ i/T1). Where and how does this gain take place? Vorlesungen uber die Theorie der Warrnestrahlung. By Dr. Max Planck. Pp. viii + 222. (Leipzig: Johann Ambrosius Barth, 1906.) Price 7 marks.

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