Question

can u say me in detai about the bernoullis theorem??

Answer 1

Bernoulli’s theorem, in fluiddynamics, 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. First derived (1738) by the Swiss mathematician Daniel Bernoulli, the theorem states, in effect, that the total mechanical energy of the flowing fluid, comprising the energy associated with fluid pressure, the gravitational potential energy of elevation, and the kinetic energy of fluid motion, remains constant. 

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Answer 2

Bernoulli's principle is a concept of fluid dynamics. It says that when an incompressible fluid moves through different sizes of tube, the fluid's speed changes. This change in velocity is called "acceleration". Newton showed that acceleration only occurs through the action of a force. When a force acts over an area, it is called "pressure". A higher pressure pushes (accelerates) fluid toward lower pressure. So any change in a fluid's speed must be matched by a change in pressure (force). Bernoulli saw that while the fluid moved more quickly in the smaller part of the tube, the pressure became less. Please note that this refers to changes in speed and pressure along a single path of flow and does not apply to two different flows at different speeds.