General Knowledge - Basic General Knowledge - Discussion

Inhaled air has the same composition as normal air, it contains:

78% nitrogen
21% oxygen
1% inert gas such as argon
0.04% carbon dioxide
little water vapour


Exhaled air contains less oxygen and more carbon dioxide, it is also saturated with water vapour. Exhaled air contains:

78% nitrogen
17% oxygen
1% inert gas such as argon
4% carbon dioxide
saturated with water vapour

The Composition of Nitrogen remains the same for both Inhaled air and Exhaled air.

This expired air typically composed of:

78% nitrogen.
13.6% - 16% Oxygen.
4% - 5.3% Carbon dioxide.
1% Argon and other gases.

Both inhale & exhale the percentage of nitrogen being same.

I also think that it contains only carbon dioxide.

I think it contains carbon dioxide and nitrogen.

I think it only contain carbondioxide.