Vapor diffusion was studied from volatile liquids of three brands of UAE gasoline: Super, Special, E+ and a mixture of these brands. The studying was conducted at 50 oC which represent the highest atmospheric temperature in UAE. The diffusion coefficients of Super gasoline ( 98 Octane number) was equal to 6.348 E-07, for special gasoline ( 95 octane number) equal to 7.353 E-07, for E+ (octane number 91) equal to 2.169 E-06, and the mixture of these three brands is 6.302E-07 m2/s. This concluded that super gasoline which has the higher octane number, minimum density, and higher heat of combustion has the lowest diffusion coefficient with air
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