XV. On the ratio of the specific heats of some compound gases

The experiments to be described in the present paper are a continuation of those of which I gave an account in the ‘Phil. Trans.,’ vol. 185, p. 1. It is shown there, from experiments on methane, ethane, and propane, and their derivatives, that the monohalogen derivatives of any one paraffin have in the gaseous state the same ratio of the specific heats, and that this ratio is the same as that of the hydrocarbon itself in two of the three series. Methane proved to be an exception, having a higher ratio than its derivatives.