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2014-08-06T03:04:44+05:30

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Pressure P  = k H     
              H = height of mercury column        k = proportionality constant

P = M L^-1 T^-2  =  k  L
so k = M L^-2 T^-2
k = has units of N/m³
at atmospheric pressure , 1 * 10^5 N/m²      H = 76 cm = 0.76 meter
so k  = 1.31 * 10^5 N/m^3
pressure P =  1.31 * 10^5 H      where H is the height of mercury column


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