Electronegativity values derived from various methods are compared, and a complete electronegativity scale is arranged for all the elements. A chart is given which shows a systematic relation of electronegativity to the periodic system of the elements. A linear relationship is found between electronegativity and the work function of metals.

Diffusion coefficients are measured for physical absorption using a laminar jet apparatus. The COz+water system is examined over a wide temperature range. The systems NzO+water and N20+water glycerol are examined at constant temperature over a wide range of concentrations of glycerol solutions. A modified Stokes Einstein equation is proposed. Values of diffusion coefficients are obtained with an error of about 1 "/,.

Pilot plant studies on a sieve tray with %-in. diameter holes and its downcomer were carried out for the systems air/water, air/aqueous glycerol, air-02/water, air-C02/water, air-C02/aqueous sodium carbonate, and air-C02/aqueous caustic soda. Comprehensive experiments on hydraulics, mass transfer, efficiency, and interfacial area were conducted in the same apparatus so that interactions could be studied between the significant parameters. A range of values of gas and liquid rates, at a constant weir height, were studied with respect to (i) hydraulic parameters such as pressure drop, liquid heads, and froth heights on the tray, and (ii) tray efficiency, number of transfer units, and the mass transfer coefficient. Measured values of interfacial area of the froth were obtained for a range of flow rates of the liquid.

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An extensive study is presented of the performance of two columns of different geometry and size each with 1 in. diameter holes. The significance of these factors on pressure drops across the dry and wet trays is considered with special reference to residual pressure drop. Experiments were made in which sampling of the vapor between trays was carried out as a means of establishing the extent of entrainment of liquid under different flow conditions. The results were examined on the basis of existing theory. Weeping and dumping for 1 in. diameter holes was examined.