Principle of refrigerator and pressure cooker

The principle of refrigerator and pressure cooker is as follows:

Refrigerator, refrigerator provides mechanical energy through motor and works on refrigeration system through compressor. The principle of refrigeration system is that the refrigerant with low boiling point absorbs heat when it evaporates. Its advantages are long service life and convenient use. At present, 9 1 ~ 95% refrigerators in the world belong to this category. At present, commonly used refrigerators use a refrigerant named R600a as a heat "porter" to "carry" the heat in the refrigerator to the outside of the refrigerator.

The principle of pressure cooker is simple, because the boiling point of water is affected by air pressure. The higher the air pressure, the higher the boiling point. On mountains and plateaus, the air pressure is lower than 1 atmospheric pressure, and water can boil below 100℃. Eggs are not cooked in ordinary pots and pans. When the air pressure is greater than 1 atmospheric pressure, water will boil only when it is higher than 100℃. The pressure cooker that people commonly use now is designed by using this principle. The water in the pressure cooker is closed tightly, so the steam generated by water evaporation can't diffuse into the air, and can only stay in the pressure cooker, so that the pressure in the pressure cooker is higher than 1 atmospheric pressure, and the water also boils when it is higher than 100℃, thus forming a high-temperature and high-pressure environment inside the pressure cooker, and the rice can be cooked easily and quickly. Of course, the pressure in the pressure cooker will not be infinite, otherwise it will become a bomb.