The rubber bulb of a medicine dropper must be kept pressed, before putting it into the liquid. Why?
Answers
Answer:
Water does not run out of a dropper unless its rubber bulb is pressed. Explanation: The pressure inside the dropper is same as the atmospheric pressure when the rubber bulb is not pressed. ... But when we press the rubber bulb the pressure inside the dropper increases and hence the water flows out.
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Explanation:
Answer:
It is the expansion of the rubber bulb which draws the liquid upward, and it cannot expand if it is not first squeezed. Air pressure pushes liquid up into an expanding bulb since the expansion of the bulb, with no access for air to enter, creates a partial vacuum. and
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 rise of water in the dropper is due to. ... Atmospheric pressure.