If the atmospheric pressure is 76 cm of mercury at what depth of water
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well your are question is missing half line(at what depth of water the pressure become for atmospher) well the ans is
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At surface there is a pressure of 1 atmosphere. Hence we need to find the depth of water to get pressure of 3 atmosphere.
Since for mercury the liquid column height is 76 cm and its density 13.6 g/cm3 , the required depth is 3×76×13.6 = 3101 cm = 31.01 m
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