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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?
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 ______.
Draw the diagram of a clinical thermometer and label its parts.
State the similarities and differences between the laboratory thermometer and the clinical thermometer
The thermometer which ranger from -10°C to 110°C is ______.
All clinical thermometers have a ______ that prevents mercury from flowing back into the bulb.
Mercury is a poor conductor of heat.
Why mercury or alcohol is used in thermometers?
Fig 4.3 (a–d) shows a student reading a doctor’s thermometer. Which of the figure indicates the correct method of reading temperature?
Why is it advised not to hold the thermometer by its bulb while reading it?
