On chemical refrigeration
Chemical refrigeration uses chemical methods to cause low temperatures. The ancient masters, although not as detailed as today in the theory of chemical refrigeration, have also observed the relationship between changes in physical state and heat and cold.

The husband of chemical refrigeration is related to all kinds of reactions, and its key term is the reactant. Reactants are the starting point of refrigeration, and all kinds of chemical refrigeration reactions are initiated by the interaction of reactants. The two are the heat of reaction, which is the cardinal of refrigeration. Or absorb or release, the nature of the heat of reaction determines the effect of refrigeration. Endothermic reaction, the heat of the surrounding environment is taken away, resulting in low temperature.

Furthermore, the catalyst is also an important item. Although it itself does not participate in the formation of the final product, it can change the rate of chemical reaction, in the refrigeration reaction, or promote its speed, so that the refrigeration is faster.

And there are reaction conditions, the genus of temperature and pressure. Appropriate reaction conditions can make the chemical refrigeration reaction smooth. High temperature or cause the reaction to be too fast and difficult to control, low temperature or slow down the reaction. The same is true of pressure, improper pressure, or resistance to the reaction.

View the application of chemical refrigeration, in people's livelihood, can keep food fresh. Use suitable chemical refrigeration materials to surround food to reduce the temperature and slow down the rot. In medicine, it can store the effect of medicinal agents and avoid their deterioration due to heat.

Therefore, if you understand the principle of chemical refrigeration, understand its key terms, and make good use of them, you can benefit all industries, increase the well-being of people's livelihood, and promote the progress of science and technology.