Richard C. Tolman and Paul Ehrenfest, "Temperature Equilibrium in a Static Gravitational Field", offprint from Physical Review, December 15, 1930, vol 36 #12, pp 1793-1798. Original wrappers. Very good condition. $150
"...the Tolman–Ehrenfest effect...created by Richard C. Tolman and Paul Ehrenfest, argues that temperature is not constant in space at thermal equilibrium, but varies with the spacetime curvature...This relationship leads to the concept of thermal time which has been considered as a possible basis for a fully general-relativistic thermodynamics. It has been shown that the Tolman–Ehrenfest effect can be derived by applying the equivalence principle to the concept that temperature is the rate of thermal time with respect to proper time."--Wiki
- Abstract: "In the case of a gravitating mass of perfect fluid which has come to thermodynamic equilibrium, it has previously been shown that the proper temperature T0 as measured by a local observer would depend in a definite manner on the gravitational potential at the point where the measurement is made. In the present article the conditions of thermal equilibrium are investigated in the case of a general static gravitational field which could correspond to a system containing solid as well as fluid parts..."
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