Answer: Temperature is the statistical average of the thermal motion of the molecules of a substance.
Absolute temperature: The temperature starting from the lowest limit temperature when the gas molecules stop moving, recorded as T. The unit is "Kelvin", and the unit symbol is K.
Celsius temperature: The temperature starting from the melting point of ice, the unit is "Celsius", and the unit symbol is 
.
In addition, the United Kingdom and the United States often use "Fahrenheit temperature", and the unit symbol is F.
The conversion relationship between the three temperature units is
