What is the application of stress in life?

Sweep the heavy snow accumulated on the roof in winter to prevent the roof from crushing; Weight limit signs for roadside signs to prevent crushing the road surface.

pressure cooker

Pressure cooker is made by increasing the air pressure in the pot and raising the boiling point of water. When using the pressure cooker, there is a sealed container in the lid of the pressure cooker. When heating, the temperature of water in the pot keeps rising, and the evaporation of water is also accelerating. Because the pot is sealed, there is more and more water vapor above the water surface, and the air pressure in the pot is getting bigger and bigger until the air pressure valve is pushed up to escape, and the air pressure in the pot does not increase but decreases. At this time, the air pressure in the pot is generally close to 1.2 atmospheric pressure. Under such air pressure, the distance between water molecules becomes smaller. In order to reach the distance between gas molecules, a higher temperature is needed, and the boiling point of water will be close to 120℃. Cooking food is a heating process. The higher the temperature, the faster it will cook, so cooking in a pressure cooker is naturally easy to cook.

Cloth stacker

Those buildings or bridges built on soft soil foundation are supported by piles, which are generally made of reinforced concrete and driven deep underground by pile drivers. The work of pile driver is a heavy hammer, which is called piling hammer. Generally, the piling hammer has a large mass, so as to increase the pressure of the piling hammer on the pile when the heavy hammer falls, and let the pile go deep into the ground. Pressure is a physical quantity, and it is the function of pressure. The greater the pressure, the more obvious the effect. This way can also be said to be direct pressure application.

Semiconductor pressure sensor

Most semiconductor pressure sensors use some form of piezoresistive effect, that is, when pressure is applied to the resistor, its resistance value will change. For example, escalators (elevators) run very slowly when no one is there. When people stand on it, the pressure on the semiconductor pressure sensor increases, the resistance decreases and the current increases, thus accelerating the operation of the motor.