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प्रश्न
Explain why, we can easily move our hand in air but to do the same through a plank of wood, we need a karate expert.
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उत्तर
We can move our hand easily in air because the force of attraction between the particles of air is very small, as there are large inter-molecular spaces in air. However, we can’t move our hand through a plank of wood because the force of attraction between the particles of wood, which is a solid substance, is very strong and the inter-molecular spaces are negligible. That is the reason why we can’t move our hand through a plank of wood and need a karate expert to do so.
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संबंधित प्रश्न
What is volume ?
Give reason:
Why do liquids and gases flow but solids do not ?
Write whether the following statement is true or false.
A gas has no free surface.
Write true or false for statement. Rewrite the false statement correctly.
Solids and liquids can flow.
Name the phenomenon which cause the following change:
Conversion of water into steam.
Gases
- cannot be compressed easily,
- occupy the entire space of the container.
- have definite shapes.
- cannot flow.
Give reason of Why do liquids and gases flow but solids do not ?
Fill in the blank
The physical state of a substance, which has a fixed volume but no fixed shape is _______
Give reasons for the following:
Solids have a definite shape and are highly rigid while gases have to definite shape and are least rigid.
Fill in the blank:
The three states of matter are classified on the basis of differences of certain _________.
