What is the important content of observing and recording the weather? What is the symbol 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 thermometer; 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 often feels differently. 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 thermometer, electronic thermometer and infrared thermometer according to different needs.

Please pay attention to the measuring range of the thermometer before using it. When in use, let the air bubble fully contact with the measured object. When reading, wait until the pointer of the thermometer is stable before reading. When reading, the thermometer must still be in contact with the measured object, and the line of sight should be flush with the upper surface of the liquid column in the thermometer.

thermometric scale

① Fahrenheit temperature

Founded by Fahrenheit (Netherlands) in 17 1686. He initially stipulated that the mixture of ammonium chloride and ice was 0°F；; ; People's body temperature is100 f, and later it is stipulated that the mixture of pure water and ice is 32°F；; In a standard state; The boiling point of water is 211.9532 f, and the two standard points are divided into 180 equal parts, 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℃; ; Change the volume of alcohol by one thousandth to 1 R, so that the boiling point of water is 79.9792r.

③ Centigrade scale.

It was founded in 1742 by Celsius (17/kloc-0-1744, Sweden). At first, he set the freezing point of water at 0℃; ; 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.

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