Zu Chongzhi
The continuing availability of Wang Mang's device has ensured it an important place in researching historical Chinese metrology for millennia. Investigations on the jialiang were undertaken by such scholars as Liu Hui of the Three Kingdoms period and Zu Chongzhi and Li Chunfeng of the Tang dynasty. According to the research of modern scholar Liu Fu 劉復, at the time of its creation, following its measurements, the standard units correspond to the modern metric system in this way: 1 chi (尺) was 23.1 cm; 1 sheng (升) was 200 mL; and 1 jin (斤) was 226.7 g.