Which liquid metal is used for making thermometers?

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Mercury

Bromine

Iodine

Cadmium

answer is A.

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Detailed Solution

Mercury is used for making thermometers.
Mercury is used in many thermometers. The mechanism of the thermometer is the expansion of liquid when it comes in contact with a hot object. Mercury is the most suitable for this purpose because its shiny colour makes it easily detectable. In addition, mercury is liquid for a large temperature range around room temperature, so it is convenient.

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