Take a jar tight a balloon on the place of lid of the jar , place a pointer of sharp edge straw on it now place it in sunny area and note where the pointer is moving up or down .write your observation for atmospheric pressure.
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Answer:
The balloon shifts up and down because of the change in atmospheric pressure. The air inside the jar is here working as a reference point.
Explanation:
When the straw moves, a colourful paper is held behind it as a background. Now the position of the straw is marked with a point 'A'. Due to the presence of sunlight, the pressure in the air changes and the straw is seemed to rise from its previous position. When it rises, we mark the changed position with the point 'B'.
So, the straws moves upward, from poin A to point B, as the result of this experiment.
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