AIR EXERTS PRESSURE
1.Take a glass tumbler and fill it with water up to the brim .
2.No air gap should remain with between the water level and the rim of the glass .
3.Cover the glass with a post card or cardboard piece.
4.Invert the glass quickly .
5.Notice what happens .
6.Write the observation and reasons .

Dear student,                     
​Please find below the solution to the asked query  
   

The cardboard piece will not fall when the glass would be inverted. This is because enough force is provided to push the cardboard piece by ​atmospheric pressure.
 
Hope this information will clear your doubts about the topic.   
​If you have any more doubts just ask here on the forum and our experts will try to help you out as soon as possible.  
       
Regards                           

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