What do you think of temperatures above zero and below zero? What is the difference?

If you don't look at the glass in the room, there will be a mixture of water and ice on the glass between 0 degrees Celsius and/kloc-0 degrees Celsius. If it is between 0 and-1 degree Celsius, ice will generally form.

From the point of view, it is the intensity of the thermal motion of the object molecules. Temperature can only be measured indirectly through some characteristics of an object that changes with temperature. The scale used to measure the temperature value of an object is called a temperature scale.

It specifies the reading starting point (zero point) of temperature and the basic unit for measuring temperature. The international unit is the thermodynamic temperature scale (K). At present, other temperature scales widely used in the world are Fahrenheit scale (F), centigrade scale scale (C) and international practical temperature scale.

From the point of view of molecular motion theory, temperature is a sign of the average kinetic energy of an object's molecular motion. Temperature is the collective expression of a large number of molecular thermal movements, which has statistical significance. For a single molecule, temperature is meaningless. According to an observable phenomenon (such as the expansion of mercury column), the degree of heat and cold is measured by one of several arbitrary scales.

Extended data:

When the temperature is high to a certain extent, the oxygen in the air burns into a flame to transfer heat, which can lead to the melting of the substance, and when it is extremely high, it will destroy all the energy in the substance.

When the temperature is low enough, it can be frozen with water or air or water (blood) in the body to transfer the cold. Freezing will cause the material to break, and when the temperature is extremely low, it will destroy the quality and energy of the material. Anything that is life-threatening can change the moving speed of an object.

The temperature of gas in the atmosphere is the temperature, which is a common term in meteorology. It is directly affected by solar radiation: the more solar radiation, the higher the temperature. China is expressed in degrees Celsius (℃). The ground temperature mentioned by the meteorological department refers to the temperature in the louver at a height of about1.5m.

Relationship between Celsius and Fahrenheit: t =1.8t℃+32 (t is Celsius and t is Fahrenheit).

The relationship between Celsius temperature and Kelvin temperature: K =℃+273. 15.

Compared with the empirical temperature scale, the advantage of the ideal gas temperature scale is that it has nothing to do with any specific properties of any gas. No matter what kind of gas is used, when the pressure is extrapolated to zero, they determine the same temperature value.

However, the ideal gas temperature scale depends on the * * * nature of gas, and is not suitable for extremely low temperature (the boiling point of helium is below 1.0 1× 10Pa) and high temperature (above 1000℃). Moreover, the ideal gas temperature scale is not convenient enough in specific operation.

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