State the reason why water gets filled in the dropper when we press the bulb of a
dropper before placing its nozzle in water.
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Due to air pressure, the water in the dropper increases. The air in the tube and the bulb escapes in the form of bubbles when the bulb is squeezed. Because of this, pressure decreases inside the bulb. Atmospheric pressure on the liquid surface however is present. The water flows inside the tube as we release the bulb. Water passes from a higher pressure (water retained) to a lower pressure (glass tube inside).
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