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Dimensional formula (ML“'T?), , Pascal’s law:- Pressure applied to an enclosed fluid is transmitted to all part, of the fluid and to the wall of the container., Application of Pascal’s law:(1) Hydraulic lift, presses etc., (2) Hydraulic brakes, Pressure exerted by liquid column:- P = hpg, where h= depth of liquid,, p=density , g=acc,. due to gravity., Variation of pressure with depth: P=P,+hpg, where P, =atmospheric, pressure, Atmospheric pressure:- The pressure exerted by atmosphere is called, atmospheric pressure., At sea level, atmospheric pressure= 0.76m of Hg column, Mathematically 1 atm = 1.013 x 10° Nm*, Archimedes’ principle:- It states that when a body is immersed completely, or partly in a fluid, it loses in weight equal to the weight of the fluid displaced, by it., Mathematically: Apparent weight = True weight — Vpg, Where V is volume of fluid displaced, p is its density., Viscosity:- It is the property of liquid (or gases) due to which a backward, dragging force acts tangentially between two layers of liquid when there is, relative motion between them., Newton’s formula for Viscous force:- the viscous force between two liquid, layer each of area A and having a velocity gradient dv/dx is, , F = nA (dv/dx) , where n is coefficient of viscosity, Coefficient of viscosity:- It is define as the tangential viscous force which, maintains a unit velocity gradient between two parallel layers each of unit, area, S.I unit of coefficient of viscosity is poiseuille or pascal-second, , Material Downloaded From SUPERCOP, , 4/20