Activity 11.9 Class 8 Science Chapter 11 Solution

Activity 11.9 Class 8 Science Force and Pressure

In this post, you will find NCERT Science Class 8 Chapter 11 Force and Pressure activity 11.9 with a complete explanation and conclusion. After reading this, you will be able to answer the questions based on the activity.

You are suggested to study NCERT activity 11.9 class 8 science explanation with a conclusion so that you can attempt questions based on activity 11.9 Class 8 science.

Activity 11.9 Class 8 Science

  ·     Take a plastic bottle.

  ·     You can take a discarded water or soft drink bottle.

  ·      Fix a cylindrical glass tube, a few cm long near its bottom as shown in Figure.

  ·     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 up to half with water.

  ·     What do you observe?

  ·      Why does the rubber sheet fixed to the glass tube bulge this time?

  ·     Pour some more water into the bottle.

  ·     Is there any change in the bulge of the rubber sheet?

     

 Activity 11.9 Class 8 Science Chapter 11 Solution

Observation and explanation 

When we pour some water into the bottle, the balloon fixed in the wall of the bottle swells.

When more water is poured into the bottle, the balloon bulge out more than before.

As we saw in activity 11.8 that liquids exert pressure on the bottom of the container, in this activity we can see liquids exert pressure on the walls of the container.

Conclusion 

This activity shows that liquids exert pressure on the walls of the container also as they do on the bottom.

Related Topics

1. Activity 11.10

2. Activity 11.8