Question

A glass jar contains a liquid of density ρ up to height of h at a place where
acceleration due to gravity is g and the atmospheric pressure is Pa.
i. What is the pressure at the free surface of the liquid?
ii. Write an expression for the total pressure at the base of the jar.
iii. What will be the lateral pressure at this depth on the inner side of the jar?

Answer 1

Answer:

(a) Pressure at free surface of liquid is the atmospheric pressure itself since P=P

A

+ρgh and for height =0, the pressure P =P

A

.

(b) At the base of the beaker of height h and density of liquid ρ, the pressure P=P

A

+ρgh

(c) Since the pressure exerted on the lateral walls is balanced by a normal reaction by walls onto the liquid, these forces must be equal and since pressure in fluids acts equally in all the directions, thereby implying P=P

A

+ρgh