The thermometer is the highest thermometer, also called medical thermometer, and it is called thermal probe in Guangdong, Hongkong and Taiwan Province. It can record the highest temperature measured by this thermometer. According to national regulations, from June 65438+1 October1day, China will completely ban the production of mercury-containing thermometers and mercury-containing sphygmomanometers.
The working substance of thermometer is mercury, and the volume of its glass bubble is much larger than that of the upper tubule. The mercury in the bubble is slightly affected by the body temperature, and the expansion of the mercury volume makes the length of the mercury column in the tube change obviously.
Classification of thermometers
1, glass thermometer: it has the characteristics of stability, accuracy and low price. The disadvantage is that it is easy to break and cause mercury pollution.
2. Electronic thermometer: It mainly uses temperature sensors and integrated circuits to measure human body temperature, which is convenient and safe. However, the accuracy of electronic thermometer is not as high as that of glass thermometer, and the measurement parts are mostly selected in forehead and wrist.
3. Multifunctional infrared thermometer: it mainly measures the brightness of the eardrum radiation, and it is also the infrared ray emitted by the blood circulation of subcutaneous aorta, which is more suitable for the elderly, the infirm and infants.
4. Chip thermometer: It belongs to a new type of thermometer. The thermometer is covered with small dots, which can change color according to the patient's body temperature, and then judge the body temperature. It is convenient to carry and has little pollution.