Would an alcohol thermometer be suitable for determining the temperature of boiling water? Justify your answer.

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Solution

No. Alcohol starts boiling at $80^{\circ}$ C while boiling point of mercury is $357^{\circ}$ C. Therefore, a mercury thermometer is used for measuring high temperatures.

Because the temperature of boiling water is 100°C but the maximum temperature alcohol thermometer can measure is 80°C.

So, It cannot measure the temperature of boiling water as it's temperature is beyond its own boiling point.

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Question 4

Boojho has three thermometers as shown in Figure. He wants to measure the temperature of his body and that of boiling water. Which thermometer(s) should he choose?

(a) Thermometer (i) or (iii) for measuring body temperature and Thermometer (ii) for measuring the temperature of boiling water.

(b) Thermometer (i) for measuring temperature of both.

(d) Thermometer (iii) for measuring temperature of both.

Q. (a) Two identical vessels A and B containing equal volume of water are placed in sun. The outer surface of one vessel A is blackened, while of other vessel B is polished. Thermometer

T_{1}

and

T_{2}

are used to measure the temperature of vessel A and B respectively. Which thermometer will record a higher temperature? Give a reason for your answer.
(b) If the two vessels A and B as described in part (a) are filled with boiling water and placed inside the room, which thermometer will show a higher temperature after 15 minutes? Give a reason for your answer.

Q. If a thermometer reads freezing point of water as

20^{\circ} C

and boiling point as

150^{\circ} C,

how much thermometer would read when the actual temperature is

60^{\circ} C

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