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2015-09-10T15:55:26+05:30

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The pressure in the dropper is equal to the pressure outside the dropper (atmospheric pressure). But as we press the rubber tube pressure inside increases. As liquid flows from a region of high pressure to low pressure it flows out. NOTE- If we press lightly only some water comes out this is because with some force applied on the rubber tube the pressure quickly becomes equal after some water has come out.
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