China's ancient mathematics was very powerful, so it served the agricultural society.
World-class mathematician Mingatu
Wang lai, a famous mathematician
Xia Yunxiang, Zhang, Hua, Chen Houyao, Gu Guanguang, Zhang, Wang, Dai, Xu Youren, Li.
Precision astronomical instruments such as armillary sphere, celestial sphere and simple instrument all need high mathematical attainments, which shows people's mathematical level at that time.
Dai Li has made great achievements in firearms. If I remember correctly, he invented Julian, a 26-gun submachine gun, but it was banned by Kangxi.
I don't know about physical chemistry, but it is very important in agricultural economics and social sciences, and there must be many professionals.