Dimensional classification of rice for marketing.

Rice has been traditionally classified in India, for the purpose
of marketing, into superfine, fine, medium and coarse. But,
despite various attempts, this classifiution has been largcly
based on arbitrary criteria. It is shown that a rational classification requires a single. uniform scale formed by a suitable
mathematical derivation from the three parameters, L (length),
B (breadth) and w(grain weight). Surface area per unit weight
(S.cm2/g) is one such derived parameter which can be an ex
cellent basiS of classification; the larger its value, the finer is
the grain. The grain weight (W) alone gives a slightly less
accurate but rough and ready basis for c1assificalion (in the inverse order).