noun
petrochemical industry
Refers to the industrial sector that produces chemicals from petroleum and natural gas.
石油化学工業はプラスチックの原料を供給している。
The petrochemical industry supplies raw materials for plastics.
石油化学 (petrochemistry) is the scientific field, while 石油化学工業 is the industry based on it.
Compound of 石油 (petroleum), 化学 (chemistry), and 工業 (industry).