The hotter the weather, what climbs higher?
Thermometers are tools that can accurately judge and measure temperature, which are divided into pointer thermometers and? Digital thermometer. A variety of thermometers have been designed and manufactured for different purposes.
On June 65438+1October 65438+1October 6, 2020, the State Administration of Pharmaceutical Products issued the Notice of the General Department of the State Administration of Pharmaceutical Products on Relevant Matters Concerning the Implementation of the Minamata Convention on Mercury on its website. The notice clearly requires that the production of mercury-containing thermometers and mercury-containing sphygmomanometers will be completely banned in China from 2026.
Instrument type
The rotary thermometer is made of curled bimetal. One end of the bimetal is fixed and the other end is connected with the pointer. The expansion degree and temperature of the two metal sheets are different, which leads to the different curling degree of the bimetal. Then the pointer points to different positions on the dial, and its temperature can be known from the readings on the dial.
The resistance change of semiconductor is different from that of metal. When the temperature rises, its resistance decreases and changes greatly. Therefore, a small amount of temperature change can also make the resistance change obviously. The thermometer has high precision and is often called a temperature sensor.
A thermocouple thermometer consists of two different metals connected to a sensitive voltmeter. Metal contacts will produce different potential differences at both ends of the metal at different temperatures. The potential difference is so small that a sensitive voltmeter is needed to measure it. We can know what the temperature is from the reading of the voltmeter.