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प्रश्न
You may have noticed that a few sharp jerks are given to a clinical thermometer before using it. Why is it done so?
उत्तर
A clinical thermometer has a kink that prevents immediate backflow of the mercury from the tube to the bulb, thus allowing us to read the temperature conveniently. This is the reason why we give a jerk to the thermometer before taking a new reading. The jerk positions the mercury below the kink into the bulb.
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संबंधित प्रश्न
In thermometer when bulb comes in contact with hot object, liquid inside it ______.
Mercury is often used in laboratory thermometers because it ______.
A clinical thermometer is calibrated from to ______.
A clinical thermometer indicates temperatures from a minimum of ______ °F to a ______ maximum of °F.
Match the following :
| 1. | Mercury | a. | Maximum minimum thermometer |
| 2. | Weather report | b. | -173.15 degree C |
| 3. | 32degree F | c. | Opaque and shining |
| 4. | 100 K | d. | 0 degree C |
Mention the use of laboratory thermometers.
Name the principle which is used in a thermometer.
Explain how do you determine the temperature of hot water using a laboratory thermometer?
Boojho has three thermometers as shown in Figure 4.1. He wants to measure the temperature of his body and that of boiling water. Which thermometer (s) should he choose?
A laboratory thermometer A is kept 7 cm away from the side of the flame while a similar thermometer B is kept 7 cm above the flame of a candle as shown in Figure 4.5.
Which of the thermometers, A or B, will show a greater rise in temperature? Give a reason for your answer.
