What Are The Common Thermometers And Their Classification

Commonly used thermometers are Mercury thermometer, digital thermometer and liquid crystal thermometer.

1. Mercury thermometer is a kind of expansive thermometer. The freezing point of mercury is -39 C, the boiling point is 356.7 C, and the measuring temperature range is -39 C-357 C. It can only be used as an instrument for on-site supervision. Using it to measure temperature is not only simple and intuitive, but also can avoid the error of external teletransmission thermometer.

2. Digital thermometer is one of the types of thermometer. According to the different materials used and the different range of temperature measurement, there are kerosene thermometer, alcohol thermometer, mercury thermometer, gas thermometer, resistance thermometer, thermocouple thermometer, radiation thermometer and photothermometer, bimetallic thermometer, etc.

Digital thermometers can accurately judge and measure temperature, and display it digitally instead of pointers or mercury. So it is called digital thermometer or digital thermometer.

3. Liquid crystal thermometer is a kind of thermometer. Its main materials are liquid crystal and glass. The phase transition temperature of liquid crystals prepared with different formulations is different. When the phase transition occurs, the optical properties of liquid crystals will also change, making the liquid crystals look discolored. If liquid crystals with different phase transition temperatures are coated on a sheet of paper, the temperature can be determined by the change of liquid crystal color. The thermometer has the advantage of easy reading, but the disadvantage is inaccuracy. It is often used in ornamental aquariums to indicate water temperature.

Extended information:

The earliest thermometer was invented by Italian scientist Galileo (1564-1642) in 1593.

His first thermometer was an open glass tube at one end and a walnut-sized glass bubble at the other. When used, the glass bubbles are heated and then the glass tubes are inserted into the water. With the change of temperature, the water surface in the glass tube will move up and down. According to the amount of movement, the change of temperature and the level of temperature can be determined.

Thermometer has the function of thermal expansion and contraction, so this kind of thermometer is greatly influenced by environmental factors such as external atmospheric pressure, so the measurement error is large.

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