Why we are using hg, why not water in boyle's law in physics?
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the principal that the pressure of a given level is equivalent to the weight of the overlying column is not only true for air but for liquids in general.the pressure generated by an overlying column of fluid is thus of termed the hydrostatic pressure...the upper boundary of the air column is the vacuum of space .being rather light,the mass of a column of air with a 1cm^2 cross section almost exactly 1kg.if a much heavier liquid substance is used to balance this air column only a relatively small length would be needed in addition,because the density of fluid does not change with height such an equivalent liquid column has a well defined upper boundary.one of the heaviest liquids at room temperature is mercury (hg) and the height of the hg column I.e equivalent to normal presure760mm long(29.92")for this reason column of hg hanging in an invert vacume tube ,can be used as practical instrument for measure atmospheric pressure...
if water used instead of hg the height of the column is equivalent to normal pressure would be 10.33m -not a very practical length of the tube to work..... hope this will help you...
if water used instead of hg the height of the column is equivalent to normal pressure would be 10.33m -not a very practical length of the tube to work..... hope this will help you...
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The density of hg is 13.6 times than the density of water.So it extends upto height 10.34m so it is difficult to use water instead of mercury in boyle's law .And our rooms are nearly of height 5m
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