How many kinds of mercury thermometers are there?

There is only one kind of mercury thermometer.

Mercury thermometer is an expansion thermometer. Mercury has a freezing point of -39℃, a boiling point of 356.7℃ and a measuring temperature range of -39℃-357℃, so it can only be used as an instrument for local supervision. Using it to measure temperature is not only simple and intuitive, but also can avoid the error of external remote thermometer.

Mercury thermometer is the most commonly used tool to measure body temperature in daily life, which is divided into two parts: temperature measurement and reading. You should reset the value of mercury before the thermometer measures the temperature. You can grasp the end of the thermometer that shows the value by hand and throw it at the temperature measuring end hard until the value is lower than 35℃.

Classification of thermometers:

1, electronic thermometer

Compared with mercury thermometers with complicated readings, electronic thermometers are simpler to display the temperature directly after measuring the temperature. Electronic thermometer can be understood as an upgraded version of mercury thermometer, which uses electronic materials instead of high-risk mercury materials. Using battery to supply power is slightly safer, but electronic components are more susceptible to the influence of environment and electricity, and the accuracy will be reduced.

2, ear temperature gun

As the name implies, the ear thermometer needs to insert the temperature probe into the ear canal, close to the tympanic membrane, in order to accurately measure the temperature. The operation of ear thermometer is much more difficult, and it is more suitable for children over two years old to ensure that the baby can't move around, so as not to hurt the ear canal.

3, forehead temperature gun

The forehead temperature gun is the simplest measurement method among many thermometers. Just aim at the forehead vertically and keep it for about two seconds to complete the temperature measurement. However, this also makes its temperature measurement accuracy not high, because any factor that causes the temperature change of the body surface will affect the result of the forehead temperature gun.