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प्रश्न
Why do we use Mercury in thermometers? Can water be used instead of mercury? What are the problems in using it?
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उत्तर
- We use mercury in thermometers as they remain in liquid form even with a change of temperature in it.
- A small change in the temperature causes change in volume of a liquid.
- Water cannot be used as a thermometric liquid, because it is not helpful to measure below 0°C and above 100°C.
- Water is transparent. So it makes the reading of the scales of the thermometer more difficult, water wets the glass tube so its steady is glass tube.
- Due to this constraints it is not used as a thermometric liquid.
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संबंधित प्रश्न
Describe a clinical thermometer. How does it differ from the thermometer used in laboratory?
The common laboratory thermometer is a ______ thermometer
Match the following
| i. | Clinical thermometer | A form of energy |
| ii. | Normal temperature of human body | 100°C |
| iii. | Heat | 37°C |
| iv. | Boiling point of water | 0°C |
| v. | Melting point of water | Kink |
Jyothi was prepared to measure the temperature of hot water with a clinical thermometer. Is it right or wrong? Why?
A clinical thermometer is calibrated from to ______.
Before use, the mercury level in clinical thermometer should be below ______.
Digital thermometers are mainly used to take body temperature.
What is the boiling point of mercury?
Mention the use of laboratory thermometers.
We are advised to avoid keeping the clinical thermometer in the sun or near a flame. Why?
