The physical characteristics （geometrical size, 1 000-grain weight, porosity rate, rest angle, internal friction angle and sliding friction angle） and aerodynamic characteristics （floating speed, floating coefficient） of coated K326 tobacco seed were measured. The results showed that average geometrical size was 1.691 mm in length, l.687 mm in width and 1.687 mm in the height; 1 000-grain weight was 5,12 g, porosity rate was 42%, rest angle was 23.49°-26.95°, internal friction angle was 4.5°, sliding friction angle was 7.85°-11.35°（st...
