A singer whose lungs had a volume of 590mL when the air pressure in the lungs was 725 mmHg expanded her lungs?

to inhale, Initially, the air pressure in her lungs dropped to 715 mm Hg. To what volume did she expand her lungs?

This is a Boyle’s law problem (constant T).

P1V1 = P2V2
(725 mmHg)(590 mL) = (715 mmHg)(V2)
V2 = 598 mL

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