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In this study, some physical properties of two wheat (Alvand cultivar) and wild oat and the effect of humidity on these properties was investigated. The effect of Grain type (wheat and oat) and humidity (9.45, 12 and 14.45%) on triple grain size, geometric mean diameter, sphericity index, bulk density, particle density, porosity, static coefficient of friction and terminal velocity in the factorial design was evaluated. The results showed that the Grain type and moisture levels, are significant effect on the physical properties of oat and wheat grains. There are exist significant differences between wheat and oat in terms of particle density, Bulk density and porosity.Also the  moisture effect on the bulk density at 1 percent and on the particle density at 5 percent but by its effect on the percentage porosity was not significant. There was highly significant differences between the friction surfaces, Graine type and moisture levels. Between surfaces, aluminum, were Maximum and steel the lowest coefficient of friction. The coefficient of static friction and the terminal velocity increases linearly as moisture increased.

Keywords: Wheat, Key word: Physical properties, Wild oat, moisture

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