Answer:
If the same volume of air is inhaled and exhaled, the air we breathe out normally weighs more than the air we breathe in.
Since the output from the body normally exceeds the input, breathing leads to weight loss.
Explanation:
If equal volumes of gas is inhaled and exhaled, the exhaled gas is heavier.
The inhaled gas contains Oxygen and majorly Nitrogen.
The exhaled gas contains COâ‚‚, Hâ‚‚O and a very large fraction of the unused inhaled air that goes into the lungs.
So, basically, the body exchanges Oâ‚‚ with COâ‚‚ and Hâ‚‚O (and some other unwanted gases in the body) in a composition that COâ‚‚, the heavier gas of the ones mentioned here, is prominent.
So, because the mass leaving the body is more than the mass entering, breathing leads to a loss of weight. This is one of the reasons why we need food for sustenance. Breathing alone will wear one out.
