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Question
When we press the bulb of a dropper with its nozzle inside water, the air present in the bulb escapes in form of bubbles. Once we release pressure on the bulb, water gets filled in the dropper. The rise of water in the dropper is driven by_________.
When we press the bulb of a dropper with its nozzle inside water, the air present in the bulb escapes in form of bubbles. Once we release pressure on the bulb, water gets filled in the dropper. The rise of water in the dropper is driven by_________.
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Solution
The correct option is D Atmospheric pressure
When we press the bulb of a dropper, the number of air molecules decreases which results in a decrease in pressure inside the dropper nozzle. However, the outside pressure or atmospheric pressure remains the same. Therefore there is a difference in pressure between outside of the nozzle and inside of the nozzle. Since water flows from a region of higher pressure to a region of lower pressure, water rushes to fill inside the dropper.
Atmospheric pressure
When we press the bulb of a dropper, the number of air molecules decreases which results in a decrease in pressure inside the dropper nozzle. However, the outside pressure or atmospheric pressure remains the same. Therefore there is a difference in pressure between outside of the nozzle and inside of the nozzle. Since water flows from a region of higher pressure to a region of lower pressure, water rushes to fill inside the dropper.
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