Question

a jet aircraft is flying at an altitude of 9000m.what will be the pressure of the air around it?

Answer 1

  If you look at the International Standard Atmosphere table, you will discover that the pressure at 9000m is 308hPa. The hectoPascal is the international unit for atmospheric pressure, it is not measured in cm of mercury. 

If you must use those units, 308hPa is equivalent to 231mm of Hg or 23.1cm of Hg.

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