Question

state the reason why water gets filled in the dropper when we press the bulb of a dropper before placing it's nozzle in water​

Answer 1

Answer:

The rise of water 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 water to go inside the dropper

Answer 2

Water gets filled in the dropper when we press the bulb of a dropper before placing it's nozzle in water​  due to difference in atmospheric pressure.

Explanation:

• The water in the dropper rises due to air pressure.
• When the bulb is pressed, the air in the tube and bulb escapes in the form of bubbles.
• As a result, the pressure inside the bulb lowers. However, atmospheric pressure exists on the liquid surface.
• As we remove the bulb, water flows within the tube.
• Water moves from a greater pressure (retained water) to a lower pressure (glass tube inside).