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can you give some experiments based on 'changing area changing pressure' (main topic or heading)
Pressure is the force on an object that is spread over a surface area.
Some simple practical experiments are,

 The Floating Water experiment
Fill a glass tumbler completely full of water.
Put some  stiff piece of paper over the top of the glass.
Standing over a sink (by  practice) hold the index card to the top of the cup and flip the cup.
Holding the cup, let go of the paper
The water  stays floating in the cup defeating  gravity.


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