Oxygen supports combustion. Furthermore,
the higher the concentration of oxygen, the more potential there
is for a fire. When the oxygen level exceeds 21 percent, an oxygen-enriched
atmosphere exists. In such a case, the potential for a patient fire
is extremely great. Nitrous oxide is also considered an oxidizer.
When nitrous oxide is exposed to heat, thermal decomposition results
and oxygen is released. Consequently, mixtures of oxygen and nitrous
oxide should be considered an oxygen-enriched atmosphere.
Fires involving an oxygen-enriched atmosphere are hotter, more
vigorous and more intense than those in ambient air, and they
spread more rapidly.
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