Question

explain Bernoullie's theorem in brief

Answer 1

Bernoulli's theorem. Bernoulli's theorem, in fluid dynamics, relation among the pressure, velocity, and elevation in a moving fluid (liquid or gas), the compressibility and viscosity (internal friction) of which are negligible and the flow of which is steady, or laminar.

Answer 2

It states that for a stream line flow of liquid (the flow in which every particle of liquid have same velocity and direction) the sum of kinetic energy, potential energy and pressure energy per unit mass of the area of cross section remains constant.
Ke + Pe + pressure energy /m = constant
Hope it would be helpful..