The upper part of the mercury thermometer is a glass tube and the lower part is a glass bulb. The bubbles and the lower end of the test tube are filled with pure silver, and the test tube is marked with a temperature scale. Since the highest temperature of human body is not more than 42℃ and the lowest temperature is not less than 35℃, the scale of thermometer is 35℃ to 42℃, and each cell represents 0. 1℃. When testing the thermometer, the glass bulb at the lower end of the thermometer is in contact with the human body. Because the temperature of the human body is higher than that of the thermometer, the mercury in the glass bulb is affected by the heat from the human body, and its volume expands and rises along the glass tubule until the mercury temperature is the same as the human body temperature.
How to use a mercury thermometer;
1. Disinfect with 75% alcohol or Jing Qing tablets before use, and throw the mercury column below 35.5 degrees Celsius.
2. Put the oral thermometer under the patient's tongue and close your lips. Take it out for direct reading after measuring for three minutes. The oral thermometer can also measure the temperature under the armpit, but the measurement time is five minutes and the reading should be 0.5 degrees Celsius.
Precautions:
1, before measuring the body temperature, all factors that affect the actual body temperature (such as drinking boiled water or cold drinks, etc.). ) should be avoided.
2. The maximum temperature of the glass thermometer is 42 degrees Celsius, so the temperature should not exceed 42 degrees Celsius during storage or disinfection. Because the glass of the bulb is thin, excessive vibration should be avoided.
3. Children can't be used for oral temperature measurement alone, but should be monitored by adults.
4. It is forbidden to damage the thermometer. If it is damaged in use, it should be dealt with urgently. Do not swallow and recycle mercury to prevent poisoning and environmental pollution.
Use a mercury thermometer to ensure sufficient measurement time.
When measuring the body temperature with a mercury thermometer, you must ensure enough time, such as 5 minutes for underarm measurement and 3 minutes for oral measurement. When measuring under the armpit, first throw the thermometer below 35℃, and then put the mercury end of the thermometer on the top of the armpit to ensure that the thermometer is in close contact with the skin. After 5 minutes, take out the thermometer, read the thermometer reading and wipe it with toilet paper for the next use.
If you have sweat under your arm, wipe it clean and then test it. In addition, if the underarm measurement is released before the time is up, it needs to be re-measured and the time needs to be recalculated. When measuring the oral cavity, first throw the mercury thermometer below 35℃, and be sure to put the thermometer under your tongue and hold it down for 3 minutes. Don't talk during this time, wipe it with toilet paper after reading it, and wipe it with alcohol cotton ball from the end of mercury thermometer to the other end of mercury for disinfection.