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The initial moisture adsorption of soybeans was examined under the conditions : RH, 57-86% ; temperature, 16。 -34。 , and storage time, 100 hours. The changes in moisture content as a function of time held a relation: log dw/dt = b log t + log a, where w is the moisture content (%, db), t is time (hour) and a and b are the parameters which were calculated from the experimental data. The calculated moisture content from the equation agreed well with the measured moisture content. The activation energy of initial adsorption rate was about 15500cal/g-mole in all soybeans. The initial adsorption rate at temperature 16。-28。 could be estimated from a following equation: log(log dw/dt) = -15500/2.303RT.
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