Abstract
The influence of methane on the hydrogen-oxygen reaction was studied in the region of the second-explosion limit. The experimental data show that there exists a critical concentration of methane, below which both methane and water vapor produce an identical reduction of the explosion limit. Observations on the course of the slow reaction also show that the accelerating effects of these additives on the rate of combination of hydrogen and oxygen are directly related to one another. It is postulated, on the basis of both the explosion and slow reaction rate data, that methane and water vapor influence the kinetics of the hydrogen-oxygen reaction by similar processes.

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