A dan or shi (Chinese: 石; pinyin: dàn, shí) in China, koku in Japan and seok in Korea, is a unit of volume mainly for grains.
It originated in China and later spread to other places in East Asia.
[1] One dan is divided into 10 dous or 100 shengs.
It is 100 litres in China,[2][3] 180.39 litres in Japan[4] and 180 litres in Korea.
[5] For more details, please see Sheng (volume)