An eagle is flying above a mountain of height 2,700 m above sea level. Calculate the pressure on the eagle if the average density in the air is 1.3kg/m^3, the atmospheric pressure at sea level is 76cm Hg and the density of mercury is 13,600 kg/m^3.
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The mercury level in the tube of the barometer falls until it is about 76cm(760mm) vertically above the mercury level. It is the atmospheric pressure acting on the surface of the mercury in the trough that supports the vertical mercury column.
The atmospheric pressure is therefore specified by so many millimetres of mercury. For example, the atmospheric pressure is 760mm Hg at sea level.
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