Atmospheric Pressure at Sea Level Is Equal to a Column

question 49

Multiple Choice

Atmospheric pressure at sea level is equal to a column of 760 mm Hg. Oxygen makes up 21% of the atmosphere by volume. The partial pressure of oxygen (PO₂) in such conditions is

• A) 160 mm Hg.
• B) 16 mm Hg.
• C) 120/75.
• D) 21/760.
• E) 760/21.

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