Gravimetrical properties of sunflower seeds and their kernel, like those of other seeds, are essential for the design of equipment for handling, separating, sorting dehulling and drying.In this study, geometrical properties of three varieties of Iranian sunflower seed and its kernel (Shahroodi, Fandoghi and Azar gol) were evaluated as a function of size category and variety with moisture content ranging of from 3 to 14% (d.b.). In this moisture range, thousand grain mass, true volume, true density and porosity were increased linearly for both of seeds and kernels in all varieties and categories. The bulk density of seeds and kernels was decreased as moisture content increased from 3 to 14%.

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