In fact, the question of how to read the degree with a mercury thermometer is not complicated, but many friends don’t know much about how to read the temperature with a mercury thermometer. Therefore, today the editor will tell you Let me share some knowledge about how to read degrees with a mercury thermometer. I hope it can help everyone. Let’s take a look at the analysis of this problem together!
Contents of this article
- How to read the temperature with a mercury thermometer
- Why can’t I see the thermometer reading clearly
- How do I read the thermometer when I hold it under my arm?
- How to read the original thermometer
- Teach you how to read the thermometer
- How to read a thermometer without mercury
1. How to read the temperature with a mercury thermometer
Measure for 5-10 minutes; take out the thermometer. The thermometer has thermal inertia and should be read after the thermometer reaches a stable state. When reading, you should read in the highest tangent direction of the temperature convex meniscus and look directly at it.
2. Hold the tail of the thermometer with one hand, that is, the end away from the mercury column, keep your eyes and the thermometer at the same level, then slowly turn the thermometer and look at it from the front When you reach a very thick mercury column, you can read the corresponding temperature value by looking at the triangular area between the scale and the numbers; the triangular area acts as a magnifier. Hold the top of the thermometer with two fingers and shake it gently, and you will see a metal line.
3. When reading, be careful not to touch the mercury end of the thermometer with your hands. This will affect the mercury column and cause inaccurate measurement. The mercury thermometer should be in contact with the measured The flow direction of the working fluid is vertical or inclined.
Mercury thermometer, a type of thermometer, is made of glass and contains a column of mercury that rises with body temperature. Mercury thermometers are widely used in the medical field and ordinary households. They can be purchased in some pharmacies.
Mercury thermometer is also called \”medical thermometer\”. The working substance of the thermometer is mercury, and its vacuole volume is much larger than the volume of the thin tube above. The mercury in the vacuole expands due to the influence of body temperature, which will cause the mercury column in the tube to expand.Significant changes in length. The temperature of the human body generally changes between 35°C and 42°C, so the scale of the thermometer is usually 35°C to 42°C. The range of each degree is divided into 10 parts, so the thermometer can be accurate to 1/10 degree.
The neck of the lower part of the mercury thermometer near the vacuole is a very narrow constriction. When measuring body temperature, the mercury in the vacuole expands when heated. It can rise from the constriction to a certain position of the pipe column. When it reaches thermal equilibrium with the body temperature, the mercury column becomes constant. After the thermometer leaves the human body, the outside temperature is low, the mercury shrinks in volume when it is cold, and breaks off at the narrow constriction, so that the part of the mercury that has risen into the tube cannot return, and the mercury column still maintains the height it reached when it came into contact with the human body. the height of. A thermometer is a maximum thermometer that can record the highest temperature ever measured by the thermometer.
After use, the thermometer should be \”returned to the surface\”, that is, holding the upper part of the thermometer and shaking it down hard, so that the mercury that has risen into the tube will return to the surface again. In the vacuole; other thermometers cannot swing. This is a major difference between thermometers and other liquid thermometers.
2. Why can’t I see the thermometer reading clearly
1. 1. If the mercury thermometer is damaged or leaking, and there is insufficient mercury inside, the measured body temperature will not reach the true scale. Therefore, you should first observe whether the surface of the thermometer is damaged before using it. When measuring the temperature, pay attention to whether the body temperature can rise. If it matches your own body temperature, you can also put the thermometer in a basin. If bubbles are produced, it means the thermometer is leaking;
2. 2. Whether to use Correct. The mercury thermometer must be shaken a few times before use to allow the mercury to return to its original position before measuring the temperature. This will be accurate. If you are measuring the armpit temperature, wipe off the sweat in the armpit first and place the mercury end of the thermometer under the armpit. , clamp the thermometer with your upper arm, and take a reading after measuring for 5 minutes. Incorrect methods may easily lead to inaccurate body temperature measurement;
3. 3. Can’t read, mercury The thermometer is very thin. You have to look carefully to see that there is a silver line displayed on the scale, and you need to rotate it just enough to see the edge that magnifies the mercury injection inside. Otherwise, you will not be able to see the mercury line.
3. How to read the thermometer by holding it under your arm
1. Measuring body temperature under the armpit is the most widely used method. If you use a mercury thermometer to measure, generally measure for at least five minutes before taking out the mercury thermometer.Observe the position where the mercury scale rises to. The corresponding scale is the armpit body temperature.
2. Electronic thermometers usually have an LCD screen to directly display the measured temperature. body temperature.
3. Whether it is a mercury thermometer or an electronic thermometer, the normal range for measuring armpit temperature is between 36-37℃. If it exceeds 37℃, Consider having a fever.
4. If the measured temperature does not reach 36°C, it is best to re-measure to see if the thermometer is not clamped in the armpit. Inaccuracies.
4. How to look at the original thermometer
After taking the temperature, Take out the thermometer, pinch the end of the thermometer, read the end of the thermometer with mercury, turn the thermometer to the side with degrees and scales, face yourself, face it to the light, and then turn the thermometer slightly repeatedly until you see the gap between the degrees and the scales. The gap is where the mercury is, and then read it according to the reading method of the thermometer.
The starting temperature of the thermometer is 35℃, the maximum temperature is 42℃, there are 14 large divisions in total, one large division is 0.5℃, and each large division is 5 Each small grid represents 0.1℃
5. Teach you how to read a thermometer
1. Disinfect the thermometer. Before using a mercury thermometer, you need to disinfect the thermometer with alcohol to avoid measurement infection.
2. After the thermometer is disinfected, you need to shake the thermometer first to shake the mercury below 35 degrees.
3. Take the reading after measurement. Place the thermometer under your armpit for three to five minutes, then remove it and read according to the position of the mercury.
6. What do you think of a thermometer without mercury
1) Thermometer The degrees are from 35 to 42 degrees. The scale has 14 large grids. One large grid represents 0.5 degrees. One large grid is divided into five small grids, each small grid represents 0.1 degrees.
(2)ReadingWhen using the mercury thermometer, your eyes should be level with the upper surface of the liquid column in the mercury thermometer, then grab the end without mercury with your hand, hold it horizontally, then slowly rotate the mercury thermometer, and observe the mercury thermometer while rotating. You can see where the mercury is.
Pay special attention to the position of your hands. Never hold the mercury end with your hands, otherwise the temperature measurement effect will be affected.
(3) Generally, look at the edge between the scale and the numbers, with the scale facing up and the triangle edge facing you. You will see a white mercury line, which corresponds to The digital position is the corresponding body temperature.
Okay, this is the end of the article, I hope it can help everyone.
