The earliest pressure cooker
The Frenchman Deni Papan (1647—1712) was an assistant to Huygens. In 1675, Papan came to the UK to work with Robert Boyle. In 1680 he was elected to the Royal Society. In 1681, he published an article introducing the "digester". A "digester" is a device that softens a bone in a sealed vessel to soften it. As we now know, when boiling water under high pressure, the boiling point is higher, which enhances the water's solvency.
working principle
The principle of the pressure cooker is simple, because the boiling point of water is affected by the gas pressure, and the higher the gas pressure, the higher the boiling point. In the mountains and plateaus, the air pressure is less than 1 atmosphere. If the water is less than 100 °C, the water will boil. The eggs are uncooked with ordinary pots. When the air pressure is greater than 1 atmosphere, the water will boil at temperatures above 100 °C. The pressure cookers that people use today are designed using this principle. The pressure cooker closes the water quite tightly. The water vapor generated by the evaporation of water cannot diffuse into the air. It can only remain in the pressure cooker, so that the pressure inside the pressure cooker is higher than 1 atmosphere, and the water should be higher than 100 °C. When it is boiling, the inside of the pressure cooker forms a high temperature and high pressure environment, and the rice is easy to cook quickly. Of course, the pressure inside the pressure cooker will not be unrestricted, or it will become a bomb.
classification
Ordinary aluminum alloy pressure cooker, stainless steel composite bottom aluminum alloy pressure cooker, stainless steel pressure cooker, electric pressure cooker 4 kinds.
One should not choose improperly.
From the raw materials: generally divided into two kinds of aluminum alloy and stainless steel, aluminum alloy is more affordable, the surface oxide layer should not be damaged, can be quickly cooled with cold water; stainless steel is corrosion resistant.
Capacity specifications: There are several models of 18, 20, 22, 24, and 26 cm. But if you think about thermal efficiency, you would rather pick a bigger one.
The pressure is divided into 70KPa (170KPa), 80KPa (180KPa), and 90KPa (190KPa), and the damage to nutrition is also large.
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