Which types of gases are classified as non-flammable compressed gases?

Non-flammable compressed gases are those that do not ignite or burn in air under standard conditions. In this context, nitrogen, helium, and argon are prime examples of non-flammable gases. These gases are categorized as inert or noble gases, meaning they possess chemical properties that make them stable and unlikely to participate in combustion reactions.

Nitrogen, for example, makes up about 78% of the Earth's atmosphere and is used extensively in various industrial applications, including as a protective gas for preventing oxidation in processes such as welding. Helium, known for its low density and lack of reactivity, is frequently utilized in applications such as balloons and as a cooling medium in cryogenics. Argon, another inert gas, is commonly found in light bulbs and is used to create an inert atmosphere in welding to prevent contamination.

Acetylene and propane, as well as hydrogen and methane, are classified as flammable gases because they can easily ignite and support combustion, making them hazardous under certain conditions. Carbon dioxide is not flammable, but it is typically not classified as a non-flammable compressed gas given that it can extinguish flames and is often considered in contexts involving fire safety rather than as a gas for combustion or processes that require non-flammability