Letter | Published:

Heat of Reaction and Gravitational Field

Nature volume 104, pages 392393 (18 December 1919) | Download Citation



A SIMPLE relation between the variation of mass in a physical change of state or chemical reaction and the rate of variation with gravitational potential of the corresponding change of total internal energy can be deduced as follows:—Let m1 and m2 denote the masses of the initial and final states of the chemical system and Q the heat evolved, say at constant temperature and pressure, and at the gravitational potential Z. Considering the following isothermal cycle:

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  1. University College, London, December 10.

    • F. G. DONNAN


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