Why use a pressure cooker to cook food easily?
Pressure cookers, when boilers are heated, the pressure in the pot is very high. Why in high-pressure conditions is the food in the pot easy to cook?
Under standard atmospheric pressure, the boiling point of water is 100 ° C. Using a conventional pot to cook food; the pot temperature cannot be higher than 100 ° C. When the fire is raised or the cooking time is prolonged, the result can only cause the water from the liquid to turn into gas, which means evaporation. The water temperature cannot exceed 100 ° C. That’s because water molecules at 100 ° C already have enough energy to dislodge the barrier of air molecules that become water vapor. But suppose the pressure of the surrounding air is high. In that case, the water molecule must have higher energy to overcome the airborne “barrier” to enter the air, turning into water vapor. . The energy of a water molecule completely depends on the temperature of the water itself. The higher the temperature, the greater the energy of the water molecule. Therefore, if you want to boil water at a higher boiling point temperature, cook food faster, and increase the pot’s pressure.
On the ground, the object is subjected to an atmospheric pressure of about 101.3 kPa. From the ground going deep into the ground, the depth kept increasing by 1,000 m, following the increasing pressure, the water’s boiling point rose 3 ° C. In a mine at a depth of 300 m, water must reach 101 ° C to boil. If you want to bring water to 200 ° C to boil, the pot’s pressure must reach 1418.2 kPa (14.18 at).
Under a low-pressure situation, the boiling point of water will also drop. For example, when boiling water on Mount Everest, the water reaches 73.5 ° C, it begins to boil. At such temperatures, the food is difficult to cook. So in the low-pressure region on the plateau, taking advantage of a pressure cooker to cook food is the most effective way of cooking.
