Question

A student pours water in a bottle and drills three holes at different height in the bottle. The water starts coming out as shown. What can the student infer from the observation?

Answer 1

Answer:

When the cap is on the bottle, the air pressure in the bottle is equal to the air pressure outside the bottle. Since the pressure is the same nothing comes out of the uncovered hole at first. When the cap is taken off, the water squirts out of the bottle.

Answer 2

Inference of this experiment:

• The pressure of water increases with increase in depth.

Explaination:

• When the cap of the bottle is opened, atmospheric pressure acts on the water column.

• Also, water exerts its own hydrostatic pressure. This pressure increases with increase in depth.

• So, at the lower holes, the pressure of water is much higher and hence, the water comes out with greater velocity and travels higher distance.

• The exact opposite scenario happens with the upper holes.

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