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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?
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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
A thermometer is used to measure ______.
Mercury is often used in laboratory thermometers because it ______.
A clinical thermometer is not used to measure the temperature of air, why?
What is the use of kink in clinical thermometer?
Why do we use Mercury in thermometers? Can water be used instead of mercury? What are the problems in using it?
Digital thermometers do not use ______.
Mercury is a poor conductor of heat.
Explain how do you determine the temperature of hot water using a laboratory thermometer?
A laboratory thermometer A is kept 7 cm away on the side of the flame while a similar thermometer B is kept 7 cm above the flame of a candle as shown in the following figure.
Which of the thermometers, A or B, will show a greater rise in temperature? Give reason for your answer.
Why is it advised not to hold the thermometer by its bulb while reading it?
