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Question
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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Solution
- 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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