The equilibrium relative humidity (ERH) of rough rice, brown rice, corn kernels, corn cobs, soybeans, and redbeans was measured at temperatures ranging from 5 to 50C. Four ERH models and their estimated parameters wereevaluated for goodness-of-fit. Hysteresis effect was found for the ERH properties of rough rice, corn kernels, and corncobs. Drying temperatures of samples had a significant effect on the ERH properties. Comparing results of this study withpreviously published data, the effect of the ERH determining method did not influence ERH properties. Varietal andgrowing location differences did affect the ERH property for some grains.
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C. Chen (2000) studied this question.