Question

What is mean by bernoullis principal

Answer 1

Velocity hike of any fluid along by decrease of pressure.  

Swiss scientist Daniel Bernoulli demonstrated that in maximum cases pressure in liquid/gas decreases as liquid/gas moves faster.

Bernoulli's principle shows that an increase in fluid speed happens same time with decrease in pressure of potential energy of liquid.  

Principle is named after Daniel Bernoulli who published it in book Hydrodynamica in 1738.

Answer 2

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Bernoulli's theorem:

The Bernoulli's theorem states that for an ideal fluid, under steady state condition, the sum of kinetic energy per unit volume, potential energy per unit volume (or sum of mechanical energy per unit volume) and pressure per unit volume is constant.

Equation of Bernoulli's theorem:

$\huge{{{\boxed{\boxed{\bold{\frac{\rho v^2}{2}+\rho gh + P = Constant}}}}$

$\\\textbf{where,}\\\bold{\rho} =\textbf{Density of fluid}\\P = \textbf{Pressure}\\v = \textbf{Velocity of fluid in section.}\\g =\textbf{Acceleration due to gravity}\\h = \textbf{Height in the direction of gravity}$

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