Question

please explain the activity of 11.9 on book of science class 8 NCERT of Kendriya Vidyalaya books

Answer 1

Answer:

Science Activity 11.9

Explanation:

In this activity, we have to take a bottle and fix a cylindrical glass tube, a few cm long near its bottom as shown in Fig. 11.15. You can do so by slightly heating one end of the glass tube and then quickly inserting it near the bottom of the bottle. Make sure that the water does not leak from the joint. If there is any leakage, seal it with molten wax. Cover the mouth of the glass tube with a thin rubber sheet as you did in Activity 11.8. Now fill the bottle upto half with water.

The rubber sheet or ballon will bulge, since the fast moving molecules of water exert pressure on it, similarly it would be offering pressure on walls of bottle.

Answer 2

Answer:

STEPS:

1) Take a plastic bottle.

2) Fix a cylindrical glass tube a few cm near its bottom. (Make sure the water doesn't leaks)

3) Cover the mouth of the glass tube with a thin rubber sheet.

4) now, fill the bottle up to half with water.

OBSERVATION:

We observe that a liquid exerts pressure on the walls of the container as the rubber sheet bulges due to the increase of water in the container.

Ty...

HOPE IT HELPS (: