Explain with an example that atmosphere exerts a huge pressure.
Take a hollow sphere. Cut it into two hemispheres. Place the two hemispheres in contact with each other. You will find that when there is air inside the hemispheres, two get easily separated. This is because there is air on both the sides of sphere at same pressure and hence net force on each hemisphere is zero and could be easily separated.
Now remove the air by using vacuum pump from the two hemispheres by placing in contact with each other. When there is prefect vacuum inside, you will see that you are not able to separate them by applying a large force. As shown in figure, if we have a sphere of surface area 1 m2, we need the weights more than 10 quintal to separate the two hemispheres. This experiment shows that air exerts a huge pressure.
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