Question

Water from a dropper does not come out unless it is not pressed explain it?

Answer 1

1. Atmospheric pressure: The force exerted on the earth's surface by the weight of air present in the atmosphere.
2. Liquid Pressure: Pressure exerted by the liquid, according to Pascal's law the pressure transmits uniformly in all the directions.
3. The dropper is used to transfer small quantities of liquids.
4. Until we press the dropper water does not come out because in the initial condition the pressure on both sides of the dropper is the same which is equal to atmospheric pressure.
5. When we press the dropper the pressure of inside water, this increase in pressure creates a pressure difference, and as a result of that water comes out of the dropper.