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प्रश्न
Give reasons:
We can easily move our hand in air, but to do the same through a solid block of wood, we need a karate expert.
उत्तर
- We can easily move our hand in the air, but to do the same through a solid block of wood, we need a karate expert.
- It is because the molecules of air have less force of attraction between them, and a very small external force can separate them and pass through them.
- However, in solids, the molecules have the maximum force of attraction, and the particles are tightly bound due to this force. Hence, a large amount of external force is required to pass through the solid.
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संबंधित प्रश्न
Give a reason for the following observation.
Naphthalene balls disappear with time without leaving any solid.
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Explain how, the smell of food being cooked in the kitchen reaches us even from a considerable distance.
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A student placed a gas jar containing air in the upside down position over a gas jar full of red-brown bromine vapours. He observed that the red-brown colour spread upwards into the jar containing air. Based on this observation, the student concluded that it is only the bromine vapour which moves up and diffuses into air in the upper jar, the air from the upper jar does not move down by diffusion into the lower jar containing bromine vapours. Do you agree with this conclusion of the student? Give reason for your answer.
Comment upon the following:-
fluidity
Comment upon the following:-
density
Which of the following is false for gases?
