The air pressure supplied to a scuba diver must equal that exerted by the surrounding seawater, and for each 10 m increase in depth,pressure of the surrounding seawater increases one full atmosphere. Assuming the partial pressure of oxygen in air at sea level (one at-mosphere) is 0.209 × 760 mm Hg (= 159 mm Hg), what partial pressure of oxygen would a diver be breathing at a depth of 30 m?

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