Physics
At sea level, the atmospheric pressure is 76 cm of Hg. If air pressure falls by 10 mm of Hg per 120 m of ascent, what is the height of a hill where the barometer reads 70 cm of Hg. State the assumption made by you.
Fluids Pressure
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Answer
Given,
Atmospheric pressure = 76 cm of Hg
Change in pressure = 76 cm of Hg - 70 cm of Hg
= 6 cm of Hg
Pressure falls by 10 mm (= 1 cm) of Hg for every 120 m of ascent,
Therefore, for 6 cm of Hg we get,
Hence, the height of the hill = 720 m
The assumption made is that the atmospheric pressure falls linearly with ascent.
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