At normal temperature and pressure, the boiling point of water is 100 degrees. That is to say, when the temperature reaches 100 degrees, water will quickly evaporate from liquid to steam, and then from liquid to gas, and its volume will expand at least several thousand times. The boiling point of oil is very high, much higher than 100 degrees. Although the oil pan seems calm at this time, it is actually higher than 100 degrees. When a drop of water falls into a hot oil pan, it will sink immediately because water is heavier than oil. However, the high temperature makes the water droplets evaporate rapidly, and the volume expands rapidly, which expands inside the oil pan, driving the oil droplets to disperse, thus forming a violent reaction of the oil pan, producing a huge sound and bursting. If someone is around at this time, oil droplets with extremely high temperature will drop on people, causing burns. So when cooking or frying with oil, try not to drop water into the pot, and the spatula should be as dry as possible. If you need to pour the ingredients with water, remember to pour them slowly from the side of the pan and protect them. Don't directly face the oil pan.
Moreover, once the oil pan catches fire due to explosion, never douse the flame with water. According to the previous principle, pouring water will cause oil droplets to disperse more, and the fire will run farther and spread more widely. At this time, oxygen should be isolated to extinguish the fire. For example, turn off the natural gas, cover the pot or cover it with a soaked rag. This can effectively put out the fire without being hurt.
But sometimes when we stir-fry, we will find that there is a lot of water in the dish, and there is also a lot of water on the surface of the washed dish, but it will not cause harm if it is put in the pot. This is because, first of all, there is little oil in the pot, and it will not splash when poured with ingredients; Secondly, a lot of water and vegetables will quickly reduce the temperature in the pot, and the temperature of oil will also drop below the boiling point, which will not cause danger. But novices should pay attention to safety.