What parts can an electronic thermometer test? Compared to traditional mercury thermometers

1. The electronic thermometer is composed of a temperature sensor, a liquid crystal display, a button battery, an application-specific integrated circuit and other electronic components. It can quickly and accurately measure the body temperature, compared with the traditional mercury glass thermometer, it has the advantages of convenient reading, short measurement time, high measurement accuracy, memory and buzzer prompt, especially the electronic thermometer does not contain mercury, which is harmless to the human body and the surrounding environment, and is especially suitable for use in families, hospitals and other occasions.

2. The advantages are high accuracy, the error is generally not exceeded, and the reading and carrying are convenient. The disadvantage is that the measurement stability is slightly worse than that of a glass thermometer.

3. When the armpit is underarmpit, the electronic thermometer should be close to the temperature-sensing part; Under the tongue, the electronic thermometer should be inserted snugly at the base of the tongue.

Temperature measurement is needed everywhere, but do you know what a thermometer is based on? Commonly used thermometers are mercury thermometers and alcohol thermometers. They are made according to the principle of thermal expansion and cold contraction.

In physics, they expand when they heat up and contract when they cool down. When the temperature changes, the liquid level in the glass tube of the thermometer rises and falls, and one can see the temperature value. Let me tell you a little secret.

Mercury hygrometers have a shrinkage opening that prevents heated and expanding mercury liquids from returning to glass bubbles. When the temperature drops, simply shake the thermometer to return the mercury liquid to the glass bubbles.

Glass tube thermometers use the principle of thermal expansion and cold contraction of liquids. Different liquids have different coefficients of thermal expansion, and the volume varies with temperature. Galileo used water as a means, but the thermometers commonly used today are mercury, alcohol, kerosene, etc.

When considering the temperature above the boiling point and the freezing point, thermometers have different application scenarios. For example, mercury has a freezing point of -39-84151, and it can solidify outdoors during harsh winters in northeastern China. It is not possible to measure the temperature ...

The boiling point of alcohol is and cannot be used to measure the high temperature of liquids.

However, due to the health and environmental health hazards of exposure to mercury, we learned Minamata (y) in Japan's nine-year compulsory education. Now, according to the Minamata Mercury Convention, China will also ban production, and from this year onwards, the import and export of mercury-containing products, mercury thermometers will gradually be phased out of the historical stage (I read the print at hand while writing) Liquid mercury is non-toxic, but when it becomes gaseous mercury, it is toxic. As a result, the mercury thermometer accidentally fell to the ground and broke.

You need to immediately open the ventilation window to lower the indoor temperature, put on a mask and gloves, collect large particles of mercury with cotton swabs or tape, spray sulfur on the lost mercury soil, then collect silver sulfur dust, seal the contaminated cotton swab and tape with a plastic bag, and send it to a special pollution treatment office for disposal.

An important difference between thermometers and other thermometers is that after the temperature is measured, the data of the mercury thermometer will remain unchanged until you return the mercury to its original position (sometimes the mercury thermometer can also break due to over-discharge) depending on the special structure of the thermometer. Notice that in the image below, there is a thin curve between the glass bubble and the straight glass tube, called the "limit".

The thermometer is made according to the principle of thermal expansion and cold contraction of mercury; Because the mercury thermometer is measured, the thermometer is placed under the person's armpit and the body temperature of the human body is exposed to the human body for a long time, so the mercury thermometer is more accurate in measuring the temperature.

It is made according to the principle of thermal expansion and cold contraction of liquid; Because this thermometer is more sensitive to temperature, the results of long-term exposure to human body temperature measurement will be more accurate.

It is made according to the principle of thermal expansion and cold contraction, because mercury is sensitive to temperature changes and is measured by long-term contact with people.

Compared with mercury, the error of electronic thermometers is basically the same, and there is not much difference.

Compared with the traditional mercury glass thermometer, the electronic thermometer is convenient to read, safe and non-toxic, the measurement time is short, it can be memorized and has a beep prompt, and the electronic thermometer does not contain mercury; Mercury thermometers have a glass case, and once the glass is broken, the spilled mercury can be harmful to the human body. As a result, mercury thermometers in modern consumer homes are slowly being replaced by electronic thermometers.

Compared with mercury thermometers, electronic thermometers are slightly less stable, and when measuring body temperature with electronic thermometers, the results will be affected by the temperature measurement time, outside air, and the measurement site, resulting in temperature deviations. Generally, electronic thermometers are most accurate in the range of 37-39, and higher or lower will be worse. Also, there is a problem with this type of product, which needs to be calibrated frequently.

1. Use the armpit measurement method.

Before use, throw the thermometer degree below 35, and then put the mercury end of the thermometer on the top of the armpit and clamp it to ensure that the mercury is in close contact with **, and the maintenance time is 5 10 minutes. Take out the thermometer, take the reading, and wipe it clean with toilet paper for next use. It should be emphasized that if there is sweat under the armpits, it should be wiped clean before measurement, and at the same time, after drinking hot drinks, strenuous exercise or bathing, it should be quiet for 30 minutes before measurement, and if the child releases before the time is reached, it needs to be re-measured, and the time should be recalculated.

2. Adopt the method of oral measurement.

It is more reflective of the real body temperature of the human body than the armpit, but this method is dangerous for children to bite through the mercury, and should not be used by patients who have difficulty breathing after fever and are unconscious.

When using the method of oral measurement, first throw the thermometer power below 35, be sure to put the thermometer under the tongue, and press the dust a little harder, including 3 5 minutes, preferably 7 minutes round clock. During this period, do not talk to the orange stove, clean it with toilet paper after taking the reading, and use a towel soaked in alcohol to wipe the end of the thermometer from the end of the thermometer to the end of the mercury for disinfection.

The measurements of the electronic thermometer are particularly accurate; The induction effect of the electronic thermometer is particularly good, particularly intelligent, with relatively high accuracy and high stability; But mercury thermometers are easy to break, and they are also exceptionally accurate and stable.

The electronic thermometer is simple and fast to use, and it is not easy to cross-infection, the mercury thermometer needs to wait for a period of time, and it is a glass product, fragile, and has a certain hazard; Electronic thermometers are not the most accurate.

The characteristic of the difference is that the electronic thermometer can directly detect the body temperature, the mercury thermometer needs to be put for a period of time to be able to detect the body temperature, and the electronic thermometer is the most accurate.

Yes, it is very accurate, you can know that a person's physical strength will also be detected in the fastest time, and I especially like to use this thermometer in my life.

The working principle of the traditional mercury thermometer is to use the principle of thermal expansion and cold contraction, and the round mercury is heated and expanded. It is a more common and commonly used body temperature measurement method, with better stability and low environmental requirements. It is more convenient to use an electronic thermometer per mu, but because of the high operation requirements, it is likely that the results will be inaccurate due to the mistake of the head of the man.

Today's thermometers are made by using the thermal expansion and contraction of liquids. The temperature measuring substance here is mercury. At room temperature, mercury is a silvery-white liquid, which is a metal that appears as a liquid at room temperature.

The silvery-white part of the thermometer on one end is actually a very thin glass bubble filled with mercury, a temperature measuring liquid. Silvery-white is the mercury color seen through a very thin glass bubble. Silvery-white is the metallic luster of mercury.

The glass bubble is non-metallic, transparent, and the most vulnerable part of the Qi Tease thermometer.

Due to the need to reduce the influence of glass on the measurement, glass bubbles are generally made thinner. However, while reducing the error, it also brings an inconvenience - the safety performance is reduced. Very thin glass bubbles, very fragile, fragile, moreover, mercury also has a certain toxicity.

Therefore, it is important to pay attention to safety when using a mercury thermometer. (If you accidentally chew mercury, you can eat raw egg white.) ）

Although mercury thermometers have made a great contribution to our human health, there are now many means and methods to measure temperature, so many scientists have been calling for the abolition of mercury thermometers. I believe that in the near future, it should be phased out.

As your ability to innovate is getting stronger and stronger, our life will become better and better.

The data measured by the mercury thermometer has the following characteristics:

1. Insoluble in water.

2. Once broken, it will sink to the bottom.

3. There is no need to talk about poisoning.

4. The mercury thermometer is made of glass, and the front file of the thermometer containing the mercury ball and the mercury column is included.

5. The temperature that can be measured by the mercury thermometer is between -38 and 357.

The reason why the mercury thermometer can accurately read the data is because the thermometer is marked with numbers, and the degree is from 35 degrees to 42 degrees, and there is a black line in the middle of the grid, where each big person represents the degree, and each small grid represents the degree.

Mercury thermometer uses.

1. Verification should be carried out before use.

2. It is not allowed to use the measured value with a temperature exceeding the maximum scale value of the thermometer.

3. The thermometer has thermal inertia, and it should be read after the thermometer reaches a stable state. Readings should be taken in the highest tangent of the temperature convex meniscus with a direct gaze.

4. The mercury thermometer should be perpendicular to the flow direction of the measured working fluid or inclined.

5. Mercury thermometers often break the mercury column.

When using a thermometer, you must first see its range, and then see its minimum graduation value, which is the value represented by each small square. The temperature of the object to be measured should be measured by selecting an appropriate thermometer.

The vacuole of the thermometer should be in full contact with the object to be measured, and the glass bubble should not touch the side wall or bottom of the object to be measured. When reading, the thermometer should not move away from the object being measured, and the eyes should be at the level of the liquid level inside the thermometer.