Thermometer is a tool that can accurately judge and measure temperature. Because of its convenient use and high precision, mercurial thermometers are widely used. However, it is inconvenient to monitor body temperature with mercurial thermometers, and mercury pollution may be serious. In order to measure the most accurate temperature of the human body, people have developed various body temperature thermometer and methods. Many hospitals have adopted electronic thermometers, and the use of other electronic instruments to measure body temperature has become increasingly popular.
At present, there are three types of body temperature meter, which are mercurial thermometer, digital thermometer and infrared thermometer. The body temperature of a normal person is kept at a relatively constant state, and its normal fluctuation range is 36-37℃ of oral temperature. The temperature of rectal temperature is 0.3-0.5℃ higher than oral, and the temperature of underarm temperature is 0.3-0.5℃ lower than oral. By monitoring the body temperature of various parts of the human body, the health of the human body can be effectively detected.
The common temperature measurement parts of the human body are the forehead, oral cavity, nasal cavity, esophagus, tympanic membrane, armpit and anus.
The working principles of the thermometer are to make use the phenomenon that solids, liquids, and gases expand and contract under the influence of temperature; under constant volume conditions, the pressure of the gas (or vapor) changes due to the difference in temperature; the role of the thermoelectric effect; the resistance varies with the temperature; the effect of heat radiation, etc.
When the mercurial thermometer is broken, first of all, we must evacuate all people and animals, quickly open windows for ventilation, and accelerate the evaporation of mercury in the air. In the next 1 to 2 weeks, try to keep indoor ventilation as much as possible. You can also ignite the concentration of mercury vapor in the air with iodine and alcohol. 10% bleach liquid can be used to wash the ground contaminated by mercury. Secondly, the scattered mercury will turn into mercury beads, which roll quickly. If the ground is smooth and flat, mercury may be scattered throughout the house, so check every corner of the house.
The clinical thermometer include mercurial thermometer, digital thermometer and infrared thermometer. The infrared thermometer measures temperature, which is relatively safe and accurate, suitable for use by the elderly, children, hospitals and families.
We can use several thermometer colleagues to measure under the same conditions and compare the test results.
The body temperature of a normal person is kept at a relatively constant state, and its normal fluctuation range is 36-37℃ of oral temperature. The temperature of rectal temperature is 0.3-0.5℃ higher than oral, and the temperature of underarm temperature is 0.3-0.5℃ lower than oral.
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