Q6 of 14 Page 155

Do liquids and gases also exert pressure? Does it depend upon on the area on which the force acts?

Yes, liquids and gases also exert pressure.


Example:


If we fill a balloon with water or air, it will start bulging. This shows that water or air exerts pressure on the walls of the balloon.


Water or air pressure also depends on the area on which the force is applied.


A large balloon will have greater walls for the application of force on filling with water or air. And thus for a constant force, the pressure will be less in a large balloon compared to that in a small one.


More from this chapter

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Why is the one end of drawing pin kept wide but the other end very sharp?

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How does pressure due to liquid held in a container vary with

a) Depth?


b) Amount?


c) Shape size of container?

 7

Name the two parameters which define pressure.

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A father and son pushed their car to bring it to the side of a road as it had stalled in the middle of the road. They experienced that they had to push with all their might initially to move the car. But the push required to keep the car rolling was smaller. Explain.