Associate Safety Professional Practice Exam

What is the characteristic of inert gases in relation to combustion?

1. They are highly flammable

2. They promote combustion

3. They do not support combustion

4. They reduce combustion rates

The correct answer is: They do not support combustion

Inert gases are characterized by their inability to support combustion. This property stems from their chemical stability and lack of reactivity, which means they do not easily form chemical bonds with other elements. Inert gases, like helium, neon, argon, and xenon, have filled electron shells that make them low in energy and non-reactive. Because they do not participate in chemical reactions that release energy in the form of heat or light—such as combustion—they effectively prevent the burning of other materials when present in sufficient concentrations. This is why options suggesting that inert gases are flammable or promote combustion are incorrect; they do not facilitate or enhance fire. While some gases can influence combustion rates, inert gases primarily serve to create an environment where combustion cannot occur, making them crucial in safety applications where fire prevention is necessary.