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Question

What do you interpret from the following:

1.We can easily move our hand in air but not through a solid material.

2.An inflated balloon when kept in a refrigerator gets reduced in its size.

3.A wooden table should be called a solid.

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Solution

(1)

The resistance encountered by our hand when flowing through air (which being less dense) is quite small compared to that in a solid material (density is high). This is why it is easier to move our hand though air.

.

(2)

Due to decrease in temperature the separation between the air molecules inside the balloon will decrease ad thus the ballon will contract.

.

(3)

A wooden should called a solid simply because it acts like one. It has a fixed shape and volume, its density is quite high and it is hard to change its configuration.


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