What is the FiO2 in room air expressed as a decimal?

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Multiple Choice

What is the FiO2 in room air expressed as a decimal?

Explanation:
FiO2 is the fraction of inspired oxygen. In room air at sea level, this fraction is about 0.21, which equals 21%. That’s why the correct decimal for room-air FiO2 is 0.21. The other numbers represent either lower oxygen levels than room air (like 0.10) or higher oxygen concentrations provided by supplemental oxygen (like 0.30 or 0.40). In practice, room air sits around 0.21, while supplemental oxygen raises FiO2 above that value.

FiO2 is the fraction of inspired oxygen. In room air at sea level, this fraction is about 0.21, which equals 21%. That’s why the correct decimal for room-air FiO2 is 0.21. The other numbers represent either lower oxygen levels than room air (like 0.10) or higher oxygen concentrations provided by supplemental oxygen (like 0.30 or 0.40). In practice, room air sits around 0.21, while supplemental oxygen raises FiO2 above that value.

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