In Korea, at least as early as the 17th century – 20th century, a unit of capacity, in the 20th century = 180.39 liters (about 5.12 U.S. bushels). Also romanized as sok, seom and som. Sŏk is the Sino-Korean pronunciation, sŏm the Korean, and in Chinese the unit is called shih.
It is often used as a unit of mass to measure quantities of rice, with differing values¹ for different types of rice:
1. J. L. Maclean, D. C. Dawe, B. Hardy and G. P. Hettel.
Rice Almanac. 3rd edition.
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Last revised: 22 January 2009.