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प्रश्न
Give reason
When an empty gas jar is inverted over a gas jar containing a coloured gas, the gas also spreads into the empty jar.
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उत्तर
This shows that gases can fill up all the space that they get, and they have neither a fixed shape nor a fixed volume. They have no free surfaces, either.
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संबंधित प्रश्न
Give reason:
Why do liquids and gases flow but solids do not ?
Match the following
| Column A | Column B |
| (a) Solids | (1) Can flow in all directions. |
| (b) Sublimation | (2) The temperature at which a liquid changes into its gaseous state. |
| (c) Boiling point | (3) Any number of free surfaces. |
| (d) Gases | (4) Gaps between particles. |
| (e) Intermolecular space | ro(5) Change of state fm solid to gas. |
Fill in the blank :
Air is a matter because it has ________ and _______ and it can be _________
Give reason of Why do liquids and gases flow but solids do not ?
Write whether the following statement are true or false.
Solids have the largest inter-molecular space.
What is the general name of :
- rigid form of matter ?
- fluid forms of matter ?
Give reasons for the following:
A bottle of perfume on opening evolves an odour which can be sensed over a long distance.
Differentiate the general properties of solids, liquids and gases in the form of a table — with reference to free surfaces.
Give a reason why –
Solids have a definite volume & a definite shape.
Match the following.
| Property | Example |
| Breaks easily (Brittle) | Metal pan |
| Bends readily | Rubber band |
| Can be stretched easily | Cotton wool |
| Gets compressed easily | Mud pot |
| Gets heated readily | Plastic wire |
