Hazardous Materials (HazMat) Transport Practice Test

Class 2 hazards are gases. A material in this class exists as a gas at normal temperatures and pressures and can be stored as a compressed gas, a liquefied gas, or a dissolved gas. Because the danger comes from the gaseous state, handling emphasizes preventing leaks, controlling expansion, and proper cylinder or container use, with labeling that reflects gas packaging. Examples you might encounter include oxygen, propane, nitrogen, and chlorine. This is different from liquids (a different hazard class) and from radiation (another separate class), which is why the correct classification is gases.