Question

Explain the working principle of a filled sytem thermometer

Answer 1

A liquid-in-glass thermometer is widely used due to its accuracy for the temperature range -

200 to 600°C. Compared to other thermometers, it is simple for usage. It has been used in

medicine, metrology and industry. In the LIG thermometer the thermally sensitive element is a

liquid contained in a graduated glass envelope. The liquid used in practical thermometers are mercury or alcohol. The principle used to measure temperature is that of the apparent thermal expansion of the liquid.

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