Question

3. Air pressure helps us to fill fountain pens,​

Answer 1

yes air pressure helps to fill fountain pens

Answer 2

Answer

Yes......!!!!

As a syringe is filled with liquid due to the atmospheric pressure,ink also get filled into a fountain pen. The pen is kept with its nib inside ink.When the rubber tube of fountain pen is pressed, almost all the air of rubber tube expels out in the form of bubbles through the ink when the rubber tube is realeased, the pressure inside the rubber tube is much less than the atmospheric pressure acting on the ink.

As a result, the ink rises into the tube through the capillary below the nib of pen.

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