Human beings expend energy during expansion and contraction of their lungs in breathing. Each exhalation from the lungs of an adult involves pushing out about 0.5 L of gas against 1 bar of pressure. This occurs about 15,000 times in a 24 h day.
a. Estimate the amount of work in breathing done by each person in the course of 24 h.
b. To get a feeling for how much work this represents, imagine using it to raise a mass to the top of a 30-story building (about 100 m). First, make a guess at how large a weight could be raised by this amount of work: 1 kg (2.2 lb), 10 kg, 100 kg, 1000 kg (about 1 ton). Now do the calculation and draw some conclusions about how much your body is working even when you are “resting.”
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