When we press the bulb of a dropper with its nozzle kept in water,air in the dropper is seen to escape in the form of bubbles. Once we release the pressure on the bulb, water gets filled in the dropper. The flow of water in the dropper is due to
-pressure of air
-pressure of water
-gravitational pull of earth
-shape of rubber bulb
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Pressure of air. This is because air present inside the rubber bulb goes out when we press it and the water goes in.
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