Pressure cooker, also known as pressure cooker and pressure cooker, is a kind of kitchen cooker. The pressure cooker exerts pressure on water through the physical phenomenon that the boiling point of liquid will rise under higher air pressure, so that the water can reach a higher temperature without boiling, thus accelerating the efficiency of stewing food. It can be used to heat cooked food to above 100℃. At high altitude, the pressure cooker can avoid the problem that the boiling point of water decreases and it is difficult to cook food. Its advantages are time-saving and energy-saving, but its disadvantages are that improper operation or defective operation may lead to explosion and personal injury. 1679 was invented by French physicist Papin.