What should I pay attention to when measuring air temperature with a thermometer?

Before using a thermometer to measure the temperature of an object, the temperature of the measured object should be estimated, a thermometer with an appropriate range should be selected, and the glass bubble of the thermometer should be in full contact with the measured object during measurement.

When the liquid column in the thermometer is stable and stable, the thermometer cannot be taken out of the measured object to be measured and read, and the line of sight should be level with the liquid level in the thermometer. Therefore, in order to make the thermometer used correctly and measured accurately, it is necessary to use and operate correctly before, during, and reading.

Before using a thermometer, care should be taken:

1.If the estimated temperature to be measured exceeds the highest temperature it can measure, or lower than the minimum temperature it can measure, it is necessary to use a thermometer with the appropriate range, otherwise the liquid in the thermometer may burst the thermometer or the temperature value cannot be measured.

2.Recognize its minimum scale value so that the temperature value can be read out quickly when measuring with it.

When measuring the temperature of a liquid with a thermometer, you should pay attention to:

1.The glass bubble of the thermometer is all in contact with the air, and do not touch other objects.

2.It usually takes about 15 minutes to read the thermometer after the indication is stable.

3.The line of sight is level with the upper surface of the liquid column in the thermometer during the reading.

It should be suspended in the air and should not touch the ground or other objects;

Do not expose to sunlight;

Keep the thermometer dry and free of water or other liquids;

Wait for the thermometer to show the temperature before reading;

There are a lot of them, but I just wrote out what I know, I hope it will help you.

Before using the thermometer, its range and indexing value should be observed.

To figure out the range and indexing value of the thermometer and then to read, that is, to see the maximum value that the thermometer can measure and the minimum value to measure, and to clarify the number represented by each large cell and each small grid.

A thermometer is a tool that can accurately judge and measure temperature, and is divided into an analog thermometer and a digital thermometer. Depending on the purpose of use, a variety of thermometers have been designed and manufactured.

The first thermometer was invented in 1593 by the Italian scientist Galileo. His first thermometer was a glass tube with an open end and a walnut-sized glass bubble at the other. To use, heat the glass bubble and insert the glass tube into the water.

As the temperature changes, the water surface in the glass tube moves up and down, and the temperature change and temperature can be determined according to the amount of movement. The thermometer has the effect of thermal expansion and contraction, so this kind of thermometer is greatly affected by environmental factors such as external atmospheric pressure, so the measurement error is large.

Here are some things to keep in mind when measuring the temperature:

1. Because the thermometer itself has a greater ability to absorb solar heat than air, the indicated readings under direct exposure to sunlight are often higher than the actual temperature of the air around it, so when measuring the temperature of the air near the ground, the thermometer is usually placed in a louver box ventilated on all sides about the ground.

2. If you need to take the thermometer out of the water to read, then the time from the thermometer leaving the water to the completion of the reading should not exceed 20s. The thermometer should have at least a precise scale and a heat capacity as small as possible to make it easy to equilibrate, and it should be regularly calibrated by the metrology department using a precision thermometer.

3. When temporarily measuring the water temperature, the glass thermometer or other temperature measuring equipment probe should be immersed in the water to be measured for a certain period of time (generally more than 5min), and then read the data after reaching the equilibrium, and the temperature value is generally accurate. Wastewater treatment pads are generally equipped with a thermometer at the inlet end of the aeration tank, and the thermometer usually uses a thermistor to measure the water temperature.

The air temperature in the weather forecast refers to the air temperature measured in the field with air circulation and not directly exposed to the sun (usually measured in a louver box). The highest temperature is the highest temperature in a day, generally occurring at 14-15 o'clock; The minimum temperature is the lowest temperature of the day, usually before sunrise.

If the thermometer needs to be taken out of the water for reading, the time from when the thermometer leaves the water to the time when the reading is completed should not exceed 20s. The thermometer should have at least a precise scale and a heat capacity as small as possible to make it easy to equilibrate, and it should be regularly calibrated by the metrology department using a precision thermometer.

1. The thermometer should be placed in a representative position.

2. Count correctly. It should be suspended in the air and should not touch the ground or other objects;

3. Do not expose to sunlight;

4. Keep the thermometer dry and do not get wet or other liquids;

5. Wait for the thermometer to show the temperature before reading;

1. The thermometer should be placed in a representative position.

2. Count correctly.

It is necessary to choose a suitable thermometer for temperature measurement to prevent the liquid column from expanding and cracking the thermometer when the temperature of the measured object is too high. When measuring the temperature, the thermometer bubble must be buried in full contact with the measured object. If the temperature of the liquid is measured, the temperature sensing bubble should be completely submerged in the liquid and should not touch the bottom and wall of the container.

When reading, it is necessary to wait for the liquid level height in the thermometer to no longer change, and the thermometer cannot leave the measured object, and the person's line of sight should be level with the liquid cylinder surface. <

1. It is necessary to choose a thermometer with a suitable temperature measurement range to prevent the liquid column from expanding and cracking the thermometer when the temperature of the measured object is too high.

2. When measuring the temperature, the thermometer must be in full contact with the measured object. If the temperature of the liquid is measured, the temperature sensing bubble should be completely submerged in the liquid and should not touch the bottom or wall of the container.

3. When reading, it is necessary to wait for the liquid level height in the thermometer to no longer change, and the thermometer cannot leave the measured object, and the person's line of sight should be level with the liquid cylinder surface.

4. Do not use the thermometer as a stirrer, so as not to break the temperature bubble.

Analysis: Yes The main problem that needs to be paid attention to is: in order to facilitate the reading of the thermometer, it is advisable to measure the temperature of the armpit; When reading, the thermometer can not be taken from the armpit out of the laboratory thermometer, its measurement range is generally from 20 110, the normal body temperature of the person is between 36 37, from the temperature measurement range, it is not a problem to use the laboratory thermometer to measure the body temperature of the person Reading the thermometer, the thermometer can leave the human body before the silver and, and do not have to leave the human body immediately when reading the number Due to the difference in structure, the laboratory thermometer can not leave the temperature measurement object when reading, and the same is true when measuring the temperature of the human body with it. Cannot be removed from the armpit In addition, due to the different uses of the two thermometers, the indexing value is also different (the laboratory thermometer is generally 1, and the thermometer is generally is, and its measurement results are not accurate enough