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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