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Previously derived relations are applied to a study of the rate of dissolution of solids in liquids in a series of geometrically similar vessels fitted with propeller stirrers. It is found that the dissolution constant, K, for any particular liquid-solid system under isothermal conditions is a function of the product of speed and size factor, nd, and this relation holds for several different agitator designs. The results for four liquid-

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The available literature on the power requirements of agitating equipment is reviewed and classified. A dynamometer is the most suitable apparatus for measuring power input to agitating equipment, and a turntable dynamometer is described for measuring the torque requirements of a rotating agitator.An equation for the power requirements of a series of dimensionally similar agitators INDUSTRIAL AND ENGINEERING CHEMISTRY

An equation is derived, expressing the rate of melting of the solid in a two-phase, single-component, liquid-solid system, based on the rate of heat transfer at the liquid-solid interface. This equation resembles the approximate, integrated form of the cube root law, and the surface coefficient of heat transfer, h, is comparable to the dissolution constant, K.The equation correlating heat transfer data for several liquids in a series of geometrically similar agitators is similar in form to the expression correlating data on mass transfer in the same equipment, and an analogy between heat and mass transfer in liquid-solid agitation systems is indi-INDUSTRIAL AND ENGINEERING CHEMISTRY Vol. 33, No. 11 "K.dp