2.
Give reasons for the following:
(b) A clinical thermometer has a slight bend, or kink, in its capillary tube
(c) A new quilt is warmer than an old one.
(d) A brass tumbler feels much cooler than a wooden tray on a chilly day.
(e) The bottoms of cooking utensils are often kept black.
(a) Iron rims are heated red hot before 'fixing' them on cart wheels.
Answers
Answer:
A clinical thermometer has a narrow kink in the capillary tube because when Mercury expands, it pushes through the kink, but when it's taken out of patient mouth, Mercury does not go back to the bulb beacuse if it. Hence, doctor can read the patients temperature easily .
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.
Brass is a good conductor of heat. Therefore when one touches the brass tumbler, heat is conducted from the body to the tumbler easily. So the temperature of the body reduces the and the brass tumbler feels much cooler than a wooden tray.
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
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.
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Answer:
1.heating the rims expand. And can easily lie down on the wheel it cool.
2.The link prevent the mercury in the capillary to fall back into the bulb.
3. Because the air which is trapped inside the cotton or swollen clothing acts as an insulator and does not allow the transfer of heat.