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The content of oxygen is normally ________% in air.

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in Construction & Building Materials by (190k points)
The content of oxygen is normally ________% in air.

(a) 100

(b) 50

(c) 73

(d) 21

The 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

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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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