heat of combustion

noun

1. chem the heat evolved when one mole of a substance is burnt in oxygen at constant volume

heat of combustion

1. The amount of heat released when one mole of a substance is completely oxidized.

Example Sentences

The problem in the case of an engine using a separate working fluid, like a steam-engine, is to find what must be the temperature θ″ of the boiler in order to obtain the largest possible fraction of the heat of combustion in the form of work.

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Taking θ′ − θ0 = 2300� C., and θ0 = 313� Abs. as before, we find θ″ = 903� Abs. or 630� C. The heat supplied to the boiler is then 74.4% of the heat of combustion, and of this 65.3% is converted into work, giving a maximum possible efficiency of 49% in place of 89%.

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It is easy, however, to see that the general effect of dissociation must be to diminish the available temperature of combustion, and all experiments go to show that in ordinary combustible mixtures the rise of temperature actually attained is much less than that calculated as in � 22, on the assumption that the whole heat of combustion is developed and communicated to products of constant specific heat.

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This limits the availability of the heat of combustion by reducing the rise of temperature actually obtainable in combustion at constant volume by 30 or 40%, and also by reducing the range of temperature θ′ / θ″ for a given ratio of expansions r from r.41 to r.29.

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Joule measured the corresponding heats of combustion, and showed that the electromotive force corresponding to a chemical reaction is proportional to the heat of combustion of the electrochemical equivalent.

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