Q1 of 7 Page 35

Answer the following question.

Why does ink not spill out of an ink dropper?

Ink enters the dropper till the pressure of the air inside the dropper becomes equal to the atmospheric pressure outside acting on the ink in the bottle. It is because the two pressures ( atmospheric pressure, Pressure of air in the dropper) are equal the ink does not spill out unless the bulb is pressed, because on pressing the bulb the pressure inside the dropper becomes more than atmospheric pressure thus the two pressures are not equal.


More from this chapter

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1

Answer the following question.

Why do knives and blades have sharp edges?

 1

Answer the following question.

Why are ski-boards that are used to glide over snow long and broad?

 2

Fill in the blanks.

(a) The unit of pressure is _______.


(b) Ink rises into the ink dropper because of the _______ pressure acting on the surface of the ink in the bottle.


(c) When the piston of a pump is pulled up, the pressure inside _______.


(d) The air pressure inside our body is equal to the _______ .

 3

Match the following.