Question

Give reason for the following.

1)A new quilt is warmer than an old one.

2) Iron rims are heated red hot before fixing them on cartwheels.

3)The bottom of utensils are often kept black.​

Answer 1

Answer:

1 ) new quilt is warmer than the old one because new one has air space between the woolen layers. these spaces traps air ,as air is a insulator they do not allow the body heat to escape and keep us warm.

Explanation:

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Answer 2

Answer:

1.A new quilt is warmer because the air which is trapped inside the cotton or woollen clothing acts as an insulator and does not allow the transfer of heat. However, when the quilt gets older, the air spacing of the cotton or wool gets compressed it no longer remains a good insulator.

2.Iron rims are made slightly smaller than the wheels. They are heated red hot before fixing them on the cart wheels to expand them so that they can be easily fixed on the wheels and water is poured on them to cool them. As the rims cool they contract and take the shape of the wheel and get firmly fixed on the wheels.

3.The bottoms of the cooking utensils are kept black because black colors absorb heat faster than any other color. For cooking, we need that the supply of heat is fast so that the food cooks quickly. This is why the bottoms of the cooking utensils are kept black in color.

Explanation:

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