He is majoring in chemistry at university.

We heat our house with natural gas.

He is an expert in chemistry.

This lake is known as a dangerous body of water.

The use of bioweapons is prohibited by international law.

He has mastered all the uses of the Eighteen Arms of Wushu.

Noble gases are known for not participating in chemical reactions.

I renovated the kitchen to install a new gas stove.

Poison gas is leaking from that factory.

I used a gas burner in a chemistry experiment.