In any fluidized bed process, the minimum fluidization velocity is an extremely important property to be determined, which provides an idea of the pumps' minimum capacity required for such process. Such velocity remains constant so long as the physical characteristics of the bed material does not change and happens to be a constant fluid velocity which has a single value for a particular system. In inverse fluidization - dealing with solids, lighter than the fluid-such velocity is called minimum inverse (or reverse) fluidization velocity, u mrf The choice of most appropriate correlation, amongst a number of existing equations, from the point of simplicity and accuracy, often becomes a difficult task. To obviate such complexity, a simple method has been suggested for heterogeneous systems which is similar to the averaging formula to determine the average particle diameter for a mixture of solids, varying in diameter of the individual species. Such equation is based on the mass fractions of the constituents and the same system properties of individual components. These are expressed by the expressions, Mathematical equation which have obtained standard deviation values of ±26.73%, ±26.04 % and 20.24%, respectively, based on 240 experimental data points.