What concentration of methane in the presence of air is explosive?

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Prepare for the REHS/RS Solid and Hazardous Waste Test with comprehensive multiple choice questions, detailed hints, and in-depth explanations. Ace your environmental health exam!

Multiple Choice

What concentration of methane in the presence of air is explosive?

Explanation:
Methane combusts explosively only within a specific fuel‑air range. In air, that explosive window is about 5 percent to 15 percent methane by volume. At around 5% or more, there is enough fuel for ignition to occur, but below this level the mixture is too lean to ignite. At around 15% or less, there is still enough oxygen, but if methane concentration rises above this upper limit, the mixture becomes too rich to sustain combustion. So the dangerous, explosive range is roughly 5–15 percent methane in air.

Methane combusts explosively only within a specific fuel‑air range. In air, that explosive window is about 5 percent to 15 percent methane by volume. At around 5% or more, there is enough fuel for ignition to occur, but below this level the mixture is too lean to ignite. At around 15% or less, there is still enough oxygen, but if methane concentration rises above this upper limit, the mixture becomes too rich to sustain combustion. So the dangerous, explosive range is roughly 5–15 percent methane in air.

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