Activity 11.8 Class 8 Science Force and Pressure
In this post, you will find NCERT
Science Class 8 Chapter 11 Force and Pressure activity 11.8 with a complete explanation and conclusion. After reading
this, you will be able to answer the questions based on the activity. After reading activity 11.7, you should go through the given activity.
You are suggested to study NCERT activity 11.8 class 8 science explanation with a conclusion so that you can attempt questions based on activity 11.8 Class 8 science.
Activity 11.8 Class 8 Science
· Take
a transparent glass tube or a plastic pipe.
· The length of the pipe/tube should be about 25
cm and its diameter should be 5-7.5 cm.
· Also
take a piece of a thin sheet of good quality rubber, say, a rubber balloon.
· Stretch
the rubber sheet tightly over one end of the pipe.
· Hold
the pipe in the middle, keeping it in a vertical position as shown in the
figure.
· Ask
one of your friends to pour some water into the pipe.
· Does
the rubber sheet bulge out?
· Note
also the height of the water column in the pipe.
· Pour
some more water.
· Observe
again the bulge in the rubber sheet and the height of the water column in the
pipe.
· Repeat
this
process a few more times.
· Can
you see any relation between the amount of the bulge in the rubber sheet and
the height of the water column in the pipe?
 |
| Activity 11.8 Class 8 Science Chapter 11 Solution |
Observation and explanation
When a little amount of water is poured into the column
first time, the rubber balloon swells a little.
Now more water is poured into the column, and the balloon swells
more than before.
As the level or height of the water column in the container increases,
the pressure increases on the bottom that’s why the balloon bulge out.
It is clear that liquids exert pressure. This pressure depends upon the height of the liquid column in the container.
Conclusion
This activity shows that liquids exert pressure on the
surface.
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