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प्रश्न
In summer, ice is kept wrapped in a gunny bag. Explain the reason.
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उत्तर
In summer, the ice is kept wrapped in a gunny bag or it is covered with saw dust. The air filled in the fine pores of the gunny bag or saw dust, is the insulator of heat. The air does not allow heat from outside to pass through it to the ice. Thus, the ice is prevented from melting rapidly.
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संबंधित प्रश्न
Write true or false for a given statement.
All solids expand by the same amount when heated to the same rise in temperature.
Fill in the blank
The temperature of boiling water is _______
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Liquids expand _______ than the solids.
Name two substances which expand on heating.
One end of a steel girder in a bridge is not fixed, but is kept on roliers. Give the reason.
State one application of thermal expansion of liquids.
State which expands more, when heated to the same temperature : solid, liquid or gas ?
______ is the only matter on the Earth that can be found naturally in all three states.
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 |
______ is greater for liquids than solids and it is maximum in gases.
