Advertisements
Advertisements
प्रश्न
In summer, ice is kept wrapped in a gunny bag. Explain the reason.
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Fill in the blank
_________ determines the degree of hotness or coldness of a body.
Name the instrument used to measure the temperature of a body.
State one application of thermal expansion of liquids.
What are the good and bad conductors of heat ? Give two examples of each.
Why do we use cooking utensils made up of copper.
Explain why we wear woolen clothes in winter.
The bottom of a cooking utensil is painted black. Give the reason.
______ 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 |
Mention the factors affecting the flow of heat.
