Mercury thermometer
A type of expansion thermometer
Mercury thermometer, is a kind of expansion thermometer, the freezing point of mercury is -39°C, the boiling point is 356.7 °C, the measurement temperature range is -39°C - 357°C, it can only be used as an on-site supervision instrument. Using it to measure temperature is not only simple and intuitive, but also can avoid the error of external remote thermometer !
What is the maximum scale of the thermometer !
Under normal circumstances, the maximum scale of the thermometer is generally 42°C.
The scale of the thermometer generally starts from 35°C, and the largest scale is 42°C, which can be divided into 14 cells, each of which is 0.5°C.
Under normal circumstances, the body temperature of the armpit will be measured. First, the mercury column should be thrown below 35°C, and then the mercury end should be placed at the top of the armpit, and the thermometer should be held tightly with the arm to avoid falling off or falling. After measuring for 5-10 minutes, the thermometer should be taken out and the temperature data should be read !
Mercury thermometers can explode at high temperatures !
The working principle of mercury thermometers is based on the thermal expansion characteristics of substances, and when the temperature rises, the amount of mercury in the mercury pool will increase, explicitly showing the process of temperature rise. However, if a mercury thermometer is exposed to a high temperature environment, such as hot water or other high temperature liquids, the mercury liquid will expand, causing the mercury column on the thermometer to rise, indicating the corresponding temperature. If the temperature is too high, mercury may reach its boiling point, at which point it evaporates into a gas, causing the thermometer to burst. Therefore, exposing a mercury thermometer to hot water or other high-temperature liquids can cause damage and even an explosion.
In addition, ordinary mercury thermometers measure between 35 and 42 degrees Celsius, if put in 70 or 80 degrees of hot water, there may be a risk of explosion. When it explodes, it gets all over the place, it contaminates the environment, and if you accidentally get it in your mouth, it can cause mercury poisoning. Therefore, the use of mercury thermometers should avoid exposing it to a high temperature environment to prevent the risk of explosion and poisoning !
