Water-Glass Experiment

Air Pressure Experiment
This is one of the best examples of air pressure experiments with water.

  • Take a glass and fill one-third of it with water. 
  • Place a cardboard over the mouth of the glass. 
  • The cardboard should be bit bigger than the mouth. 
  •  Now put some pressure on the cardboard from the left hand and invert the glass with the right hand. 
  •  Slowly remove the hand and see what happens. 
  •  The water does fall from the glass, retaining the cardboard and the water in the same place as before.  
  • This takes place because the air pressure outside,  ie.  14.7 psi,  is more heavier than the combining weight of the water and air inside the glass.

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