Definition of temperature

The temperature mentioned in the public weather forecast is measured at the observation field with turf and the thermometer in the louver box 1.5 meters above the ground. The thermometer is representative because it keeps good ventilation and avoids direct sunlight. The difference of temperature is one of the main factors that cause the difference between natural landscape and our living environment, which is closely related to our life.

Temperature records can characterize the thermal characteristics of a place, which is indispensable in both theoretical research and the application of national defense and economic construction. Temperature is one of the conventional measurement elements in ground meteorological observation. The temperature includes conventional temperature (4 times a day at the basic station and 24 times a day at the reference station), daily maximum and daily minimum temperature. The units of temperature are expressed in degrees Celsius (℃), and some of them are expressed in degrees Fahrenheit (F), all of which are expressed by one decimal place, and negative values mean zero.

China's temperature records are generally in degrees Celsius (℃). The conversion relationship between Celsius and Fahrenheit is:

C=5/9(F-32)

F=9/5C+32 (where F is Fahrenheit and C is Celsius)

Usually, people use the numerical value of atmospheric temperature to reflect the degree of heat and cold of the atmosphere. China uses centigrade scale, which is expressed in℃ and pronounced as℃.

The atmospheric temperature, referred to as air temperature for short, refers to the temperature, daily maximum temperature and daily minimum temperature at the height specified by ground meteorological observation (i.e.1.25 ~ 2.00m, and1.5m in China). Stations equipped with thermometers also have continuous temperature records. It is measured by a thermometer or thermometer installed on the shutter. These thermometers or thermometers are made according to the thermal expansion and cold contraction characteristics of mercury, alcohol or bimetal as sensors. The unit of temperature is expressed in degrees Celsius (℃), and some are expressed in degrees Fahrenheit (F), with one decimal place reserved, and a negative value means zero.

People invented the thermometer according to the principle that mercury (alcohol) expands with heat and contracts with cold, and installed it in a special device to automatically and continuously monitor the temperature.