Question

Write an expression for the pressure at a point inside a liquid. Explain the meaning of the symbols used.

Answer 1

Presure = Force / Area
= Weight of liquid / Area
= mg / A
= Vdg/A ………[∵ Mass = Volume × Density]
= ALdg/A ……[∵ Volume = Area × Length]
= Ldg

Where
L = Distance between point and surface of liquid
d = Density of liquid
g = Acceleration due to gravity = 9.8 m/s²