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The content of oxygen is normally ________% in air.(a) 100(b) 50(c) 73(d) 21The question was posed to me in unit test.My question comes from Fire Resisting Materials topic in division Fire Protection in Building, Carpentry and Joinery of Construction & Building Materials

Answer»

The correct option is (d) 21

For EXPLANATION I would say: If the oxygen CONTENT falls below 17% during a fire, rational THOUGHT and muscle control become extremely difficult. When the oxygen level falls below 6%, the breathing stops and after 4 minutes to 6 minutes WITHOUT oxygen the brain death occurs.



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