The industrial production of chemicals; short for 化学工业 huà​xué​gōng​yè

(literary) The creative power of nature; something created by nature rather than by humans.

The branch of engineering concerned with chemical production; short for 化学工程 huà​xué​gōng​chéng

Chemical processes and production techniques; short for 化学工艺 huà​xué​gōng​yì