Atmospheric pressure at sea level is 760 mm hg, and oxygen makes up 20.9% of this air when it is dry. scientists at the mt. washington observatory in new hampshire measured the atmospheric pressure at the summit of mt. washington (6,289 feet above sea level) as 609 mm hg. when the air is dry, the partial pressure of oxygen at the summit is approximately mm hg.
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Atmospheric pressure at sea level is 760 mm hg, and oxygen makes up 20.9% of this air when it is dry...
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