Question

2. What is the principle of thermometer? a) Mercury Digital thermometer- b) Thermoscan thermometer-​

Answer 1

The operating principle of a thermometer is quite simple. A known measure of liquid (mercury, alcohol, or a hydrocarbon-based fluid) is vacuum-sealed in a glass tube. The liquid expands or contracts when air is heated or cooled.

In a Mercury digital thermometer, a glass tube is filled with mercury and a standard temperature scale is marked on the tube. With changes in temperature, the mercury expands and contracts, and the temperature can be read from the scale. Mercury thermometers can be used to determine body, liquid, and vapor temperature.

Principle of thermometer states that liquid expands on heating and contracts on cooling. These liquid thermometers are based on the principal of thermal expansion. ... In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked on the tube.

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