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Experimental rates have been measured at 24°C for the solution of benzene from gas bubbles into water and aqueous slurries of activated carbon particles. Batch-type experiments were carried out so that the data at low time values gave from a single-resistance equation the mass transfer coefficient ki from gasbubble interface to bulk liquid. For bubbles whose diameter was 1.8 mm kt was about 4 X 10-2 cm/sec.The same value was obtained for the solution of benzene in water alone or in aqueous slurries of carbon particles. Rate data were measured for various concentrations of carbon particles in the slurry. Although it was not possible to achieve conditions where mass transfer to the particle surface controlled the rate, data were obtained at bubble-to-particle area ratios as high as 1.7-2.7. Interpretation of these results in terms

Dimensional analysis has been applied for the correlation of the thermal conductivity of a gas to its temperature, molecular weight, heat capacity, and critical constants. This approach indicates that the group k*h/C, should be a function of zc and T,, where h = M1/aT,1/E/Poa/3. Experimental thermal conductivities of hydrocarbons a t normal pressures (approximately 0.2 to 5 atm.) have been used to develop two relationships. The first is applicable to all types of hydrocarbons for 0.6 < T R < 3.0 with the exception of methane ond the cyclic hydrocarbons below TR = 1.0, for which the other relationship is applicable. These two relationships have been used to calculate thermal conductivities for twenty-eight gaseous hydrocarbons for which experimental data are available. Calculated values for normal paraffins, isoparaffins, olefins, diolefins, acetylenes, naphthenes, and aromatics produce an average deviation of 2.4% from experimental values for 154 points considered.