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प्रश्न
Why are quilts filled with fluffy cotton?
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उत्तर
Quilts are filled with fluffy cotton. Air is trapped in the fine pores of cotton. Cotton and air are the insulators of heat. They check heat from our body to escape and thus keep us warm.
The newly made quilts are warmer than the old ones because in the old quilts, there is no air trapped in the cotton.
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संबंधित प्रश्न
Fill in the blank
_________ determines the degree of hotness or coldness of a body.
Fill in the blank
Still air is an __________ of heat.
What do you understand by thermal expansion of a substance ?
Why are gaps left between successive rails on a railway track ?
What are the good and bad conductors of heat ? Give two examples of each.
Select good and bad conductors of heat from the following:
copper, mercury, wood, iron, air, saw-dust, cardboard, silver, plastic, wool.
The applied heat energy can be realized as an increase in the average kinetic energy of the molecules.
When we heat them the force of attraction between the molecules decreases and the ice cubes become ______.
Mention the factors affecting the flow of heat.
When heat energy is added to a substance, the kinetic energy of its particles ______ and so the particles move at a higher speed.
