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Why is only mercury used in a thermometer?
Reasons that make mercury a thermometric liquid are:
1) Visibility - Mercury is more visible than most of the liquids.
2) Melting and Boiling points - Mercury has high melting and boiling points making it a liquid over a broad range of temperatures.
3) Metallic nature - Since it is metallic in nature, it has a stable coefficient of expansion. Therefore it expands at a uniform rate throughout a broad range of temperatures.
4) Stickness - Mercury is a non-sticky metal. Therefore it makes a clear meniscus and helpful to take readings.
5) Expansion - It will not expand when it gets solidified. Therefore it doesn't break the tube of the thermometer.
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