Physical properties of some modern rice varieties
2000
Aldas, R.E. | Tado, C.J.M. (Philippine Rice Research Inst., Maligaya, Munoz, Nueva Ecija (Philippines))
The physical properties of five modern rice varieties, namely: PSB Rc26H, PSB Rc28, PSB Rc54, PSB Rc64, and PSB Rc72H were determined at different levels of moisture contents. Generally, the angle of friction and angle of repose increased with increasing moisture content for all varieties. The other properties such as axial dimensions, grain mass, and bulk densities also increased linearly with increasing moisture content. The angle of friction indicates the angle at which rice will just begin to slide when in contact with another material. The angle ranged from 28 deg to 44 deg with moisture content from 14% to 28% for all rice varieties. The angle of repose, which indicates the angle formed by a heap of rice that was poured in a flat surface ranged from 32 deg to 44 deg for all varieties. The hybrid varieties had the lowest bulk densities. PSB Rc72H, for instance, has bulk density from 454 to 522 kg/cu m for loose mode, and from 511 to 565 kg/cu m for compacted made compared with 568 to 641 kg/cu m and 642 to 709 kg/cu m loose and compacted bulk densities, respectively, for inbred varieties. The grain mass of PSB Rc26H, which ranged from 25.3 to 28.9 mg with moisture content of 13.8-25.1%, was comparable with other varieties except PSB Rc72H. Other parameters such as geometric mean diameter and sphericity, which expresses the shape of an object relative to a sphere of equal volume were calculated using the measured dimensions
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