Answer :

Given: h = 75 cm = 0.75 m


Specific gravity of mercury = 136


Density of water = 103 kg/m3


g = 9.8 m/s2


Specific gravity is defined as the ratio of density of a substance w.r.t density of any other substance. Primarily the specific gravity is measured w.r.t water



Density of mercury = 136 × 103 kg/m3 = 136 × 103 kg/m3 = ρ


Pressure exerted by a liquid is given by the relation


P = hρg


= 0.75 × 136 × 103 × 9.8


= 999600 Pa


= 10 × 105 N/m2 (approx.)


For CGS unit


CGS unit of Force dyne


1 dyne = 10-5 N 1 N = 105 dyne


1 m = 100 cm


10 × 105 N/m2 = 10 × 105 × 105 dyne / (100 cm)2


= 10 × 106 dyne /cm2 (CGS)


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