Question

When we press a bulb of a dropper with its nozzle kept in water air in the dropper escapes in the form of bubbles. Once we release the pressure on the bulb of a dropper water gets filled in the dropper. What is the reson behind it and why?

Answer 1

Answer:

Reason: Water goes in the

dropper through the nozzle because the air inside the rubber bulb had gone out(which we saw in the form of bubbles rising in water). Now there is lesser air in it or there is a partial vacuum.

So the atmospheric pressure pushes water in the dropper. This is a result of difference between pressure inside and outside the dropper.

REASON: ATMOSPHERIC PRESSURE.