Bernoulli's Principle

Definition

High speed flow of a fluid is associated with low pressure and low-speed flow is associated with high pressure
High speed = pressure low
Low speed = pressure high

Application

Aerofoil

+ wing of airplane is the shape of an aerofoil
+ such shape causes air to flow more rapidly over its surface than its lower one
+ top surface = low pressure
+ bottom = high pressure
+ the difference in pressure = upward resultant force 
+ lifts the aircraft in flight
+ an aerofoil in an inverted position = downward pressure

Carburetors

+ air is passed through a venturi tube to increase its speed = decrease the pressure
+ low pressure air is routed over a tube leading to a fuel tank
+ low pressure = suck the fuel into airflow

Bunsen Burner

+ gas comes at high speed = low pressure
+ atmospheric pressure push air into the hole
+ air and gas mixture produces blue flame

Insecticide Sprayers

+ when the plunger is pushed quickly air inside the cylinder is forced out the narrow outlet at high speed
+ a low pressure is created at the nozzle
+ atmospheric pressure pushes the insecticide out of the metal tube
+ the insecticide is carried by the air jet coming out of the outlet