The reason why the fire extinguishing effect of hot water is better than that of cold water is because the hot water is sprinkled on the fire source, on the one hand, it can play a cooling role, on the other hand, it can quickly form steam above the fire point, with the reduction of oxygen. The role of supply. If there is oxygen deficiency, the fire will be limited, and then the fire will weaken and eventually be extinguished.
The common methods of extinguishing fire are nothing more than four methods: cooling method, suffocation, isolation valve, and suppression method. Why is the effect of hot water fire extinguishing better than that of cold water? The main reason is that hot water is sprayed on the burning material, which not only can cool down, but also can quickly surround the burning material with a group of steam, so that the surrounding oxygen Reduce, once the fire is deprived of oxygen, the fire will inevitably be controlled. These steam layers play a large area of suffocation, so that the fire will be strong and weak and finally achieve the effect of fire fighting and disaster relief.
According to relevant information, if 1 kg of cold water is sprayed on the burning materials, the effective value of the fire extinguishing area can only reach 0.1 square meters; but with 1 kg of hot water, the air vapor content of 5 cubic meters can reach more than 35%, oxygenated. The amount is 14% or less. When the water vapor content in the air reaches 35% or more, or the oxygen content in the air will be below 17%, the combustion will stop, that is, the larger fire can be extinguished, so the effect of hot water fire extinguishing is better than that of cold water. Much better.
Studies have shown that the fire extinguishing efficiency of boiling water is 5 times higher than that of hot water and 10 times higher than that of cold water. In fire fighting practice, 1 liter of hot water acts as a cold water equivalent to 20-30 liters per second. If you use boiling water to extinguish the fire, the five firefighters can complete the workload of 10 firefighters, and get twice the result with half the effort. Therefore, in places where conditions permit, hot water fire extinguishing should be widely used, but care should be taken to avoid hot water scalding during the fire fighting process.