During the first phase of a fire, the oxygen concentration within the room is approximately what percent?

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Multiple Choice

During the first phase of a fire, the oxygen concentration within the room is approximately what percent?

Explanation:
Oxygen in normal air is about 21% by volume. In the early stage of a fire, the room is still largely filled with ambient air, so the oxygen level remains near that value. The fire begins by consuming some oxygen and producing heat and smoke, but not enough to drop the concentration significantly right away, so it sits around 21%. The other numbers would indicate either a much more depleted or an enriched environment, which isn’t characteristic of the initial phase.

Oxygen in normal air is about 21% by volume. In the early stage of a fire, the room is still largely filled with ambient air, so the oxygen level remains near that value. The fire begins by consuming some oxygen and producing heat and smoke, but not enough to drop the concentration significantly right away, so it sits around 21%. The other numbers would indicate either a much more depleted or an enriched environment, which isn’t characteristic of the initial phase.

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