If it is at 36.7℃, we can see that there are 7 cells after 36℃.
Mercury thermometer is divided into mercury head and the whole thermometer measuring part. When testing, the top of the mercury head can be placed under the armpit or at the bottom of the mouth, and the thermometer can be taken out after testing for 5- 10 minutes. Don't hold the mercury head.
By observing the scale, you can read the size. From 35℃ to 42℃, there are 65,438+04 large cells, each with 0.5℃ and small cells with 0.65,438+0℃. According to the reading temperature of large battery and small battery, the degree of mercury thermometer can be measured.
Brief introduction of mercury instrument:
Mercury thermometer, a kind of thermometer, is made of glass and contains mercury column that rises with body temperature. Mercury thermometers are widely used in the medical field and ordinary families, and some pharmacies can buy mercury thermometers.
Considering the harm of mercury in mercury thermometers, many countries have taken measures to ban their use. As early as 1992, Sweden banned the sale of all medical equipment containing mercury.
The Minamata Convention on Mercury came into effect in China on August 20 17 16, which clearly stipulates that "the production of mercury-containing thermometers and mercury-containing sphygmomanometers is prohibited from June 65438+1 October12026." .
The first thermometer was invented by Galileo in16th century. But it was not until 300 years later that a thermometer with convenient use and reliable performance was designed. Mercury is stored in the last mercury ball. When mercury is heated, it will expand and rise along a narrow glass tube. Therefore, a small change in body temperature will lead to a large increase in mercury in glass tubes.
After taking your temperature, you have to shake the thermometer vigorously to make the mercury return to the mercury ball.
17 14 years, Gabriel Wallenheart developed a mercury thermometer, the scale is in the range of freezing point of water and human body temperature. A Dutch doctor used it to measure the temperature of patients with fever, but the thermometer was still too big for most doctors to use quickly.
1868, German professor Wendelich published a book "Disease and Body Temperature", which recorded the temperature changes of 25,000 patients. The thermometer he uses is twice as big as Allbutt, and it takes 20 minutes to record the temperature each time.
Later, in 1867, Allbutt designed a thermometer that can measure body temperature quickly and accurately, and its length is only about 15cm. Unfortunately, Allbutt's thermometer came out too late to help Karl Vunderlikh.
About 1980, a talking thermometer was invented. The thin film liquid crystal thermometer is green when the body temperature is normal, yellow when the temperature is low, and red when the temperature is high. 1988 An electronic respiratory pulse thermometer appeared, which can be used for telemetry.