Regarding the problem of thermometers, everyone come and help

The thermometer is used to measure the internal temperature of the human body, and the maximum range is usually only about 42 degrees, because this is basically the limit of the human body. The probability of exceeding this temperature is too low, and the change in the temperature in the human body is very small, so high accuracy is required, so the scale of the thermometer is often from about 34 to 42 degrees.

There is a mercury bubble at the bottom of the thermometer, and the red one inside is mercury, and other ingredients are added to it to facilitate reading, so it is red.

When the thermometer is in the thermos flask, because the measured temperature is much higher than 42 degrees, the mercury in the thermometer expands violently, exceeding the glass tube containing mercury inside the thermometer, so the glass tube bursts. Sounds occur.

1.It's not that the thermometer doesn't change when it's gas, but that the thermometer has two initial states. A thermometer shows that the temperature is higher than the temperature of Harbin gas, that is, there is no "throw" when it is used up last time, and it is true that the indication remains unchanged.

The second thermometer shows that the temperature is lower than the temperature of Haqi, and the leaf surface of the mercury column of the thermometer must have risen, but the thermometer is filled with mercury, and the change speed is slow, and the naked eye cannot distinguish it.

2.Unplug the thermos flask and put the thermometer into the hot water in the thermos, the thermometer measures the temperature beyond the range, the mercury in the thermometer expands rapidly, and the measuring point bursts, so I hear it"Smack"A bang.

I'll also have a question: a thermometer is used to measure a person's body temperature, not the temperature of water, which is a point. The second point is that because the water temperature in the thermos flask is too high, exceeding the maximum temperature limit that the thermometer can measure, the mercury rises above the thermometer and the phenomenon of ** occurs.

Because the normal body temperature of people is not high, only 37 degrees Celsius, and the maximum temperature of high fever is only more than 40 degrees, so the maximum measurable temperature of people designing thermometers is not high, so it must be used to measure high-temperature water, that is, the reason for the occurrence of thermometers is that the water temperature it measures is too high. Do you get it now?

The thermometer works according to the principle of thermal expansion and contraction of mercury, and puts the thermometer into a thermos flask, which exceeds the range of the thermometer due to the high temperature. The mercury swelled so much that the thermometer burst. Remind you that mercury is highly toxic, be careful when handling it, and it is best to sprinkle sulfur on it.

1. When breathing into the thermometer, the water vapor adheres to the surface of the thermometer, and the temperature will rise, but the water vapor will evaporate in the air, absorbing heat during evaporation, and the evaporation speed is very fast.

2. The measurement range of the thermometer is 35 42, and the water temperature in the thermos flask is too high, beyond the measurement of the thermometer, the thermometer will burst, so you will hear a "pop".

The thermometer exploded, the watermark overflowed, the hot water temperature was too high, and the maximum temperature that the thermometer could measure was 42 degrees,

Beware that mercury is highly toxic!! The answer is obvious!

The thermometer is generally placed on the top of the armpit for measurement, waiting for 5 to 10 minutes to observe the results. Now the thermometer has a mercury thermometer and an electronic thermometer, the mercury thermometer should be gently thrown down when measuring, so that the scale is below 35, and then wipe off the sweat on the top of the armpit, put the mercury end of the thermometer on the top of the armpit, and wait for 5 10 minutes to observe the results.

The electronic thermometer is relatively more sensitive, and it is placed in the corresponding part for measurement after it is turned on, and the measurement is completed after the alarm sound is issued, and the results are observed. An electronic thermometer that measures forehead temperature at a distance of about 3 mm from the forehead. The thermometer used to measure axillary temperature is also clamped to the top of the armpit.

Some electronic thermometers may have a certain error in measurement, and can be retested with a mercury thermometer.

Be careful when using a thermometer

1. Use mercury or electronic thermometer, if there is sweat under the armpits, you need to dry it and measure it again. If the measurement time is not up, release the armpit, and re-measure and re-time.

2. After drinking hot drinks, strenuous exercise, emotional agitation and bathing, no matter what kind of thermometer you use, you need to wait for half an hour before measurement.

Human normal body temperature range:

Armpits: Forehead:

Ear temperature: oral sublingual:

The way and method of the mercury thermometer to make a certain correction before the measurement, the thermometer should hold the tail of the mercury thermometer, that is, the side of the non-mercury side, and use the strength of the wrist to shake the side with the mercury column, which can be thrown 2-3 times.

Throw the mercury back on the head of the thermometer, and then watch for the mercury to reach the point where the tick mark is, and throw the surface of the water below 36. The head of the thermometer, which is the part of the mercury, is inspected back and forth, and if it is thrown below 36, it can be clamped under the armpit for measurement.

If the mercury thermometer is too low, and the mercury level is below 35, the temperature should not be clamped at this time, and the reading will be slightly low, so the mercury thermometer can be thrown below 36.

Precautions: 1. During the operation, be careful not to touch the mercury end of the thermometer with your hands, which will affect the mercury column and cause inaccurate measurement.

2. It is best to shake the mercury thermometer after reading, and throw the mercury column below the reading line for easy use next time.

3. If you do not throw the mercury below the reading line, you will store it directly in a safe place, and the next time you use it, you must throw the mercury below the reading line before using it, otherwise the measured body temperature will be inaccurate.

4. Be sure to put the mercury thermometer in a safe place during operation, especially if there are children at home, because the outer surface of the mercury thermometer is glass, which is easy to break, and the mercury will flow out after falling, and the mercury is a toxic liquid, and if the child eats it, it will cause mercury poisoning.

1.Mercury thermometers are commonly used, first of all, let's talk about how to read. Hold the tail of the mercury thermometer in your hand so that your eyes are at the same level as the thermometer, and then slowly turn the thermometer to see the thick mercury column (the red line in the middle) from the front to read the corresponding temperature value.

Be careful not to touch the mercury end of the thermometer with your hands, as this will affect the mercury column and cause inaccurate measurement. Be sure to hold the tail and shake it before each look to make sure it's not the previous reading.

2.How to use:

Measure mouth temperature: 1) Shake the thermometer below 35 before use.

2) Place the thermometer under your tongue (just hold it, don't bite or talk too hard).

3) At least 3-5 minutes, 7 minutes is best.

4) Take out the thermometer, read the temperature data, wipe it with toilet paper, and then disinfect it with a cotton pad (wipe it from the tail end to the mercury end in a rotating way).

3.Measure axillary temperature:

1) Before use, shake the thermometer below 35.

2) Do not take a bath before measuring, first remove the sweat of the armpits, sandwich the mercury end of the thermometer in the middle of the armpits, be careful not to stick the meter out, if it is a child, pay attention to hold its arms to prevent movement.

3) Measure for 5-10 minutes.

4) Take out the thermometer, read the temperature data, and wipe the thermometer with toilet paper.

The use and perception are as follows:1. The mercury thermometer is marked with the production date and brand of the thermometer on one side, the temperature degree on one side, and the scale on the other side.

2. The degree of the thermometer represents the degree of each small grid.

3. After holding the thermometer in your hand, turn the thermometer to the middle of the degree and the scale.

4. Turn the thermometer to the middle of the degree and the scale, and you will see a silver line.

5. When you want to test the person's body temperature, clamp the temperature meter (silver place) under the armpit and take it out after 10 to 15 minutes.

6. When the time is up, read out the number next to the silver line position, and you can see that the current thermometer is the number of dust socks.

Thermometers are divided into glass thermometers, electronic thermometers, and multi-function infrared thermometers, and the use of various types of thermometers is different, and the specific steps are as follows:

1. Glass thermometer. The glass thermometer is placed under the armpit for measurement, and the sweat stains in the armpit need to be wiped clean before measurement, so as not to affect the result of body temperature measurement. Before use, you also need to observe the scale mark of the thermometer.

If the mercury is above the tick mark, hold the other side of the mercury tip of the thermometer and shake the mercury in the thermometer below the tick mark.

To measure, place the thermometer under your armpit and clamp firmly for about 5 minutes. If the clamp is not tight, the measured body temperature may not be accurate.

2. Electronic thermometer. The operation of the electronic thermometer is relatively simple, and the first step is the same as above, but the sensor head of the electronic thermometer needs to be disinfected before use, and then the sensor head is wiped clean.

After doing the above steps, turn on the switch of the electronic thermometer, and when the screen displays (Celsius), you can measure the body temperature, and then clip it in the armpit, and wait for the thermometer to send out a warning sound to indicate that the measurement has been completed.

3. Multi-function infrared thermometer. If you use an ear thermometer, replace the protective rubber sleeve on the thermometer head before use, then gently straighten the ear canal, insert the thermometer head into the ear canal, and press the upper button to start measuring the body temperature.

Generally, body temperature can be measured in one second; If you use a forehead thermometer, you need to wipe the probe clean before use, then aim the probe at the forehead, and then press the measurement button, and the measurement data can be displayed in a few seconds.