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प्रश्न
Why is a cement floor laid in small pieces with gaps in between?
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उत्तर
The floor is laid in small pieces with gaps in between to allow for the expansion during summer. However glass strips can be placed in the gaps.
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संबंधित प्रश्न
Write true or false for a given statement.
Solids expand the least and gases expand the most on being heated.
Fill in the blank
Metals are _______ of heat.
Fill in the blank
Still air is an __________ of heat.
Iron rims are heated before they are fixed on the wooden wheels. Explain the reason.
Describe one experiment to show that liquids expand on heating.
What are the good and bad conductors of heat ? Give two examples of each.
Name a liquid which is a good conductor of heat.
When we heat them the force of attraction between the molecules decreases and the ice cubes become ______.
Match the following
| 1. | Solid to liquid | a. | Condensation |
| 2. | Liquid to gas | b. | Deposition |
| 3. | Gas to solid | c. | Melting |
| 4. | Gas to liquid | d. | Vaporization |
When heat energy is added to a substance, the kinetic energy of its particles ______ and so the particles move at a higher speed.
