What is the FiO2 in normal room air?

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Multiple Choice

What is the FiO2 in normal room air?

Explanation:
FiO2 is the fraction of inspired oxygen in the air we breathe. In normal room air at sea level, oxygen makes up about 21% of the gas mixture. The rest is mostly nitrogen with trace gases. So the ambient FiO2 is approximately 21%. The other options aren’t representative of room air: 30% or 25% reflect higher oxygen content achieved with supplemental oxygen, while 16% would be lower than typical room air. Humidity can humidify the air, but it doesn’t change the percentage of oxygen, which remains about 21%.

FiO2 is the fraction of inspired oxygen in the air we breathe. In normal room air at sea level, oxygen makes up about 21% of the gas mixture. The rest is mostly nitrogen with trace gases. So the ambient FiO2 is approximately 21%. The other options aren’t representative of room air: 30% or 25% reflect higher oxygen content achieved with supplemental oxygen, while 16% would be lower than typical room air. Humidity can humidify the air, but it doesn’t change the percentage of oxygen, which remains about 21%.

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