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We can apply Boyle's Law to respiration Breathing involves Volume and Pressure. As you breathe in and the diaphragm contracts, the volume in the lung increases, while the pressure decreases. Let's say the initial volume in the lung prior to inhaling is 2300 ml, with normal pressure being 1 atm. Each breath we take involves 500 ml of air What will happen to the pressure in the lung as its volume is increased with one breath of air