Question

Working principle of simple thermometer

Answer 1

Answer:

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. 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

$\textbf{Thermometer }$:

It is an instrument used to measure temperature of an object.

A simple thermometer includes a liquid called mercury(Hg).

This mercury is a shiny liquid which can be easily seen, it don't stick to glass, and have high melting and boiling point.

Thermometer can be said to be based on the principle that Mercury rises with a rise in temperature and fall with a fall in temperature.