Science
When we press the bulb of a dropper with its nozzle kept in water, the 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 rise of water in the dropper is due to
- pressure of water
- gravity of the earth
- shape of rubber bulb
- atmospheric pressure
Answer
atmospheric pressure
Reason — When all the air escapes from the nozzle, a low pressure develops inside the tube. Due to this the atmospheric pressure, acting on water becomes more than the pressure inside the tube. As water moves from a higher pressure area to a lower pressure area, hence on releasing the bulb, water gets filled in the dropper.
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