0℃ is the temperature at which water begins to freeze, which means that 0℃ is a specific temperature value. Temperatures above zero are all represented by positive numbers, and temperatures below zero are all represented by negative numbers.

Extended data:

At standard atmospheric pressure, 0℃ is the temperature of ice-water mixture. The freezing point of water is 0℃ and the boiling point is 99.974℃. 1740 Swedes proposed that the temperature of ice-water mixture is 0 degrees Celsius, and the boiling temperature of water is 99.974 degrees at standard atmospheric pressure. According to the two fixed temperature points of water, glass mercury thermometers are graded.

Intercropping between two points is divided into 100 equal parts, and each part is called 1 Celsius. Record as 1℃. Celsius temperature has been incorporated into the international system of units. In physics, the celsius temperature is expressed as t, the absolute temperature (kelvin) is expressed as t, and the celsius temperature is defined as t=T-273. 15. Centigrade is a special name that replaces Kelvin when expressing the temperature of Celsius, and the value is 1K= 1℃.

1, the relationship between celsius and Fahrenheit: t =1.8t℃+32 (t is the temperature of celsius and t is the temperature of Fahrenheit).

2. Relationship between Celsius temperature and Kelvin temperature: K =℃+273. 15.