__Chapter 10 Mechanical Properties Of Fluids__

PRESSURE

Pressure is defined as the normal force acting per unit area.

P = F/A

Pressure is a scalar quantity.

PASCAL’S LAW

Pascal’s law states that pressure in a fluid at rest is same at all points which are at the same height.

The pressure in a fluid varies with depth h according to the expression:

P = P_{0} + ρgh, where ρ is the density of the liquid

BERNOULLI’S PRINCIPLE

It states that as we move along a streamline, the sum of the pressure and the kinetic energy per unit volume remains constant.

SURFACE TENSION

Surface tension is a force per unit length (or surface energy per unit area) acting in the plane of interface between the liquid and the bounding surface.