During the Free Burning phase, which oxygen percentage is described?

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Multiple Choice

During the Free Burning phase, which oxygen percentage is described?

Explanation:
Free Burning describes a stage where there is enough oxygen to sustain flames, but the concentration has begun to drop from ambient due to the fire’s consumption. Normal air is about 21% oxygen, and in a burning room that oxygen level can fall into the mid-teens to around twenty percent. That makes 16-21% the best fit for this phase, since it reflects a flame-present environment with some oxygen depletion but not severe enough to extinguish the fire. The other ranges don’t match typical fire conditions: 30-40% would be much more oxygen-rich than any usual room fire, and 21-23% or 15-20% either skew too high or too low to capture the characteristic free-burning period.

Free Burning describes a stage where there is enough oxygen to sustain flames, but the concentration has begun to drop from ambient due to the fire’s consumption. Normal air is about 21% oxygen, and in a burning room that oxygen level can fall into the mid-teens to around twenty percent. That makes 16-21% the best fit for this phase, since it reflects a flame-present environment with some oxygen depletion but not severe enough to extinguish the fire. The other ranges don’t match typical fire conditions: 30-40% would be much more oxygen-rich than any usual room fire, and 21-23% or 15-20% either skew too high or too low to capture the characteristic free-burning period.

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