At what altitude has the air pressure dropped to 50% (half) of air pressure at sea level (1,013 millibars) ?

Question

Marcelo Middleton

Biology

4 April, 10:30

At what altitude has the air pressure dropped to 50% (half) of air pressure at sea level (1,013 millibars) ?

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Raquel Downs · Answer 1

Atmospheric pressure is around 1,014 millibars (14.7 pounds/inch2) at sea level. At an elevation of 10 km (6 miles or about 30,000 feet), roughly the height of Mt. Everest, pressure drops to 265 millibars. That's less than 30% of the pressure at sea level.