Question

state the general Principle behind the working of a thermometer

Answer 1

Answer:

These liquid thermometers are based on the principal of thermal expansion. When a substance gets hotter, it expands to a greater volume. Nearly all substances exhibit this behavior of thermal expansion. It is the basis of the design and operation of thermometers.

Answer 2

Answer:

the measurement of temperature is performed by the temperature by using Mercury which when heated expand and contract in response to fall in temperature this causes the length of the liquid column to be longer or shorter depending on the temperature.