Bernoulli, Venturi and Coanda

An increase in the flow velocity of an ideal fluid will be accompanied by a simultaneous reduction in its pressure. 

The effect by which the introduction of a constriction to fluid flow within a tube causes the velocity of the fluid to increase and, therefore, the pressure of the fluid to fall. 

These definitions are both based on the law of conservation of energy (also known as the first law of thermodynamics ). 

Energy cannot be created or destroyed but can only change from one form to another. 

Put simply, this means that the total energy contained within the fluid system must always be constant. Therefore, as the kinetic energy (velocity) of the fluid increases, the potential energy (pressure) must reduce by an equal amount in order to ensure that the total energy content remains the 

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