How is the temperature measured?

Temperature can be measured using devices that measure the thermal energy of the particles of a substance

When the temperature rises, the speed of the molecules increases, causing an increase in the volume or area of that substance due to its expansion

Special devices are used to measure the temperature indirectly from the expansion of the material, and these devices are known as "thermometers", including the liquid thermometer; It is a thin glass tube filled with a small amount of mercury, and it depends on the thermal expansion property of the liquid as a result of high temperature, and thus the mercury becomes hotter; Which causes its size to increase and this is what appears on the scale