Question

How would you show that exhaled air has more carbon dioxide than inhaled air?

Answer 1

Exhaled air has more carbon dioxide can be shown by an experiment requiring two disposable glasses with covers and a hole on their top, two straws and some lime water. The glasses need to be filled with lime water. Then, in first glass, air is allowed to enter through the straw and in the second glass exhaled air is blown through the straw. It is observed that lime water in first glass is only slightly milky while that in the second, it is very milky. This shows that the exhaled air has more carbon dioxide, which turned lime water more milky than the inhaled air.