Which gas is an example of a compressed gas that can easily catch fire?

Propane is a hydrocarbon gas that is commonly used as a fuel and is classified as a flammable compressed gas. When stored under pressure, propane can easily ignite in the presence of an ignition source, such as a spark or an open flame. Its flammability is a critical safety concern in various environments, particularly in industrial settings and around any area where propane appliances are used.

In contrast, the other gases listed—nitrogen, argon, and carbon dioxide—are considered non-flammable and are used in a variety of applications such as preservation, inerting, and as insulating agents. These gases do not support combustion and do not pose the same fire hazards as propane does. Understanding the properties of different gases is essential for ensuring safety in workplaces that handle compressed gases.