Question

when we press and release the bulb of an nozzle kept in ink , the ink gets filled in the dropper this is due to​

Answer 1

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The rise of water in a dropper is due to atmospheric pressure. When all the air escapes from the nozzle, the atmospheric pressure, which is acting on the water, forces the water to fill the nozzle of the dropper.

Answer 2

The rise of ink in the dropper is due to atmospheric pressure.

When the bulb of a dropper is pressed, the pressure inside the dropper decreases and this causes the ink to go inside the dropper.