The Atmospheric pressure above the surface of the sea is measured by a mercury...

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hajeer_bin_sultan

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...barometer.? if the reading is 75.0cm What is the atmospheric pressure in Pa or Nm-2


Calculate also the pressure at a point 30 m below the surface of the sea.
[Take g=10ms-2;desity of mercury=13.6g cm3; density of sea water=1.025gcm3].


Explain in detail.
 
presuure at the sea surface=density of mercuryxgravitational accelerationxheight of the mercury column
pressure below the surface=pressure at the sea surface+density of sea waterxgravitational accelerationxdistance from the surface of the sea
transform the units used stating the problem in international units in order to obtain the pressures in N/m^2 or Pa
 
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