Atmospheric pressure is about 1.0 x 10 5 Pa onaverage. a) What is the downward f

Question

Atmospheric pressure is about 1.0 x 105 Pa onaverage. a) What is the downward force of the air on a desktop withsurface area 1.0 m2? b) Convert this force to pounds so you really understand howlarge it is. c) Why does this huge force not crush the desk? Atmospheric pressure is about 1.0 x 105 Pa onaverage. a) What is the downward force of the air on a desktop withsurface area 1.0 m2? b) Convert this force to pounds so you really understand howlarge it is. c) Why does this huge force not crush the desk?

Explanation / Answer

    Pressure, P = 10 5 Pa     Area, A = 1 m2 (a)     Force, F = P A                  = 10 5 N (b)     Force , F = 10 5 / 9.8 kg f                   = 10204.1 kg f     But, 1 lb = 0.454 kg        Hence, F = 10204.1 / 0.454    lb f               = 22476 lb f (c)     As, the atmospheric pressure acts in alldirections, it's net effect in any specific direction isnegligible

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