The protesters were dispersed with tear gas.

The car is gas-driven.

Marsh gas is produced in wetlands and marshes.

I use town gas for cooking and heating in my house.

My old car was a real gas-guzzler, so I decided to buy a hybrid.

The soldiers were equipped with masks to protect themselves from poison gas.

The soldiers were equipped with protective masks to defend against the nerve gas.

The gas mileage of this car is quite impressive.