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ICSE Class 9 Physics Question 19 of 19

Pressure in Fluids and Atmospheric Pressure — Question 19

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Question 17

Why does our nose start bleeding on high mountains?

Answer

Our blood pressure is slightly more than atmospheric pressure. However, at high altitude, the atmospheric pressure becomes less because the height of air column above that altitude is less than at the earth's surface. As a result, at high altitudes the blood pressure becomes much more than the atmospheric pressure and nose bleeding may occur due to excess blood pressure.