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Gallium is used as a pyrometric liquid. ...

Gallium is used as a pyrometric liquid. Why?

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Melting point of gallium is just below `30^@C`. Boiling point of gallium is about `2400^@C`.
There is a large difference in the melting and boiling points. Therefore gallium exists as a liquid in a wide range of temperature.
Hence gallium is used in liquid thermometers, for the measurement of temperature.
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