In the mixing of binary component system of fine powders which have different values of specific gravity, the value of the specific gravity of the mixture at its perfectly mixed state is predictable when the respective values of the specific gravity of the components and their mixing ratio are known. Therefore, using this predictable value of specific gravity of the perfectly mixed mixture as the representative value of the system and obtain the sample variances concerning the values of the

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... ific gravity of the samples drawn from the mixture in the process of mixing, the variance value will become a measure to evaluate the mixedness of the mixture whose components have different values of specific gravity. On this consideration, the author proposes a new method devised on the values of the specific gravity of the mixed components to evaluate the mixedness of the mixture. The experimental study was carried out to determine the utility of this method and the usefulness in practical operation of mixing was confirmed.