what is the percentage of water in inhaled and exhaled air

Dear student.

Inhaled air contains 0.02 - 0.04% water vapour. 
Exhaled air contains 5.0 – 6.3% water vapour.

The difference is due to the reason that, inhaled air takes up moisture from the mucus present in our air cavity, as a result of which the concentration of water vapour increases in the exhaled air.

Regards.

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