Question

Why is exhaled air saturated with water vapour and how could you prove that exhaled air contains more CO2 than inhaled air? Thanks :)

Answer 1

The result is that the exhaled air contains less oxygen and more carbon dioxide than the inhaled air. ...In fact, exhaled air is completely saturated with water - it contains the maximum amount of moisture and is therefore has a relative humidity of 100℅. We lose water as we breadth.