What is the important content of observing and recording the weather? What is the symbol used for living?

Temperature is an important content of observation and recording. The commonly used degree of day is degrees Celsius, expressed in degrees Celsius.

The instrument for measuring temperature is called thermometer, and the thermometer for measuring temperature is also called thermometer. A thermometer for measuring body temperature is called a thermometer, and a thermometer for measuring water temperature is called a water temperature meter; Their structures and functions are different, and they are all made by using the principle that objects expand when heated and contract when cooled.

The weather is hot and cold, and everyone's feelings are often different. We can measure accurately with a thermometer. By measuring the temperature of the surrounding air, we can know the temperature in our area.

The thermometer has information such as bubble, liquid column, scale and unit symbol.

In addition to the commonly used thermometers, people will also use water temperature thermometers, electronic thermometers and infrared thermometers according to different needs.

Please pay attention to the measuring range of the thermometer before use. When in use, let the air bubble fully contact with the measured object. When reading, don't read until the indicator of the thermometer is stable. When reading, the thermometer must still be in contact with the measured object, and the line of sight should be level with the upper surface of the liquid column in the thermometer.

thermometric scale

① Fahrenheit scale

It was founded by Fahrenheit (Netherlands) in 17 1686. He initially stipulated that the mixture of ammonium chloride and ice was 0°F；; ; The human body temperature is 100 degrees Fahrenheit. Later, it was stipulated that the mixture of pure water and ice was 32 degrees Fahrenheit; In the standard state; The boiling point of water is 211.9532 F. The two standard points are divided into 180 equal parts, and each part is1F.

② Riesling temperature scale

It was founded by Reaumur (1685-1757, French) in 1740. He set the freezing point of water at 0 degrees Celsius; ; Change the volume of alcohol to 1 R by one thousandth, so that the boiling point of water is 79.9792r.

3 degrees celsius.

It was founded by Celsius (1710-1744, Sweden) in 1742. Initially, he set the freezing point of water at 0 degrees Celsius; ; The boiling point of water was set at 99.974℃. Later, he accepted the suggestion of Swedish scientist Lin Lie and reversed the values of the two temperature points.

In 1960, the international metrology congress gave a new definition of centigrade scale, and stipulated that it was derived from the thermodynamic temperature scale. Celsius temperature (symbol T) is defined as T/C = T/K-273.438+05.