Master Mine Ventilation & Safety Quiz 2025 – Breathe Easy and Ace It!

Question: 1 / 400

Methane is considered explosive at which concentration range?

2%-10% by volume

5%-15% by volume

Methane is classified as explosive in the concentration range of 5% to 15% by volume in air. This range is critical for understanding how methane can ignite and potentially cause significant hazards in mining and other industrial environments. When methane concentrations fall below 5%, the mixture is typically too lean to support combustion, meaning that there isn't enough methane to ignite. Conversely, concentrations above 15% are considered too rich to ignite, which means there is an excess of methane that cannot sustain combustion. It is this specific range of 5% to 15% that presents the highest risk of explosion, making it essential for mine safety practices to monitor and control methane levels within this threshold to ensure a safe working environment.

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10%-20% by volume

15%-25% by volume

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