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The results of both theoretical and experimental studies on the self-ignition of single pure hydrocarbon drops are described. In this work single drops were subjected to air streams heated to such degrees that self-ignition of the drops would occur. Experimental heat and mass transfer parameters, as well as ignition delay data for different fuels and at different operating conditions were obtained. The experimental data were then used in conjunction with boundary layer correlations to evaluate the extent of the ignition delay that is physical (vaporization) and chemical (molecular interaction).