Application of Bernoulli's principle

1. Insecticide sprayers
   • The piston is pushed in, high air velocity on nozzle
   • The air pressure in the nozzle is lower than atmospheric pressure
   • Atmospheric pressure acts on the surface of the insecticide
   • Insecticide moves up through the tube
     
      
2. Bunsen burner
   • Gas flowing at high velocity, resulting in a lower pressure inside than atmospheric pressure
   • Air from outside is drawn in, mixed with gas
   • Gas and air mixture enables the burning of gas
     
      
3. Plane wing (aerofoil)
   • Air moves at higher velocity over the wing, resulting in lower pressure
   • Air moves slower under the wings, resulting in a higher pressure
   • Pressure below wing is higher than the pressure at the top
   • Resultant force acting upwards (lift)
     
      
4. Car spoiler ( inverted aerofoil)
   • Air moves at lower velocity over the wing, resulting in higher pressure
   • Air moves faster under the wings, resulting in a lower pressure
   • Pressure below wing is lower than the pressure at the top
   • Resultant force acting downwards