A thermometer is an instrument that is used to measure the temperature of a body. To measure the temperature of the body, Thermometer should be in direct contact with the body. When the Thermometer is subjected to high temperature, The Mercury will expand linearly inside the thermometer. If the Thermometer contact is broke with the body, The Mercury will regain its original position. Here raising the temperature is directly proportional to the linear variation of Mercury in the Thermometer. Mercury is the only element that is in the form of liquid at room temperature. It has a high coefficient of expansion i.e., even a slight change in temperature can be measured. Mercury has a high boiling point(356.7 O C) so high temperatures can also be measured.
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