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प्रश्न
Explain the following :
Water does not run out of a dropper unless its rubber bulb is pressed .
उत्तर
Water is held inside the dropper against the atmospheric pressure because the pressure due to height column of liquid inside the dropper is less than the atmospheric pressure. By pressing the dropper we increase the pressure inside the dropper and when it becomes greater than the atmospheric pressure the liquid comes out of the dropper.
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