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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
A thermometer is used to measure ______.
In thermometer when bulb comes in contact with hot object, liquid inside it ______.
Mercury is often used in laboratory thermometers because it ______.
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 |
State the similarities and differences between the laboratory thermometer and the clinical thermometer
The thermometer which ranger from -10°C to 110°C is ______.
Before use, the mercury level in clinical thermometer should be below ______.
What is the freezing point of alcohol?
Mention any two precautions to be followed while using a clinical thermometer.
Explain how do you determine the temperature of hot water using a laboratory thermometer?
