Pressure due to a Liquid Column - QS Study
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Let h be the height of the liquid column in a cylinder of cross sectional area A. If ρ is the density of the liquid, then weight of the liquid column W is given by

W = mass of liquid column x g = Ahρg


By definition, pressure is the force acting per unit area.

So, Pressure = [weight of liquid column / (area of cross – section)]

= Ahρg/A = hρg

So, P = hρg