Which is faster to extinguish fires, hot or cold.

The fire is extinguished because the external conditions required for combustion are removed. 1. Oxygenated air; 2. The temperature at which the ignition point is reached.

When water is allowed to extinguish fires (electrical appliances, oil, and certain burning metals cannot be extinguished with water), look at the role of water. If the water covers the source of the fire, then hot water is the same as cold water; If the temperature of the fire source is reduced, the boiling water of 100 degrees is still very low compared with the ignition point of combustibles above 800 degrees, as long as the temperature of combustibles can be lower than the ignition point, there is no difference between hot water and cold water;

If you look at it comprehensively, you can see that you can't check much of both kinds of water.

As for some people saying that water vapor, hehe, water vapor can isolate the air, so the kitchen master and the bathroom staff are not risking their lives to work, and they can't be isolated. In fact, the fine water vapor can only be used in small fires without causing trouble, and in the face of large fires, it will be easily decomposed into hydrogen and oxygen, resulting in combustion or combustion. The water used in the fire at the oil depot is only to cool the equipment next to it, and it is absolutely impossible to extinguish the fire.

Fire extinguishing depends on instant noodles flame retardant and sand. I've never seen the fire brigade drive a steam boiler car to extinguish a fire.

When it comes to using water to extinguish fires, everyone's first reaction must be to find a faucet to connect to tap water, but have you ever thought about using hot water to extinguish fires? Recently, there have been rumors on the Internet that hot water is faster than cold water to extinguish fires, is this true? Experts say that under certain conditions, hot water fire extinguishing is indeed faster than cold water fire extinguishing.

Hot water. Extinguishing a fire with hot water, which can quickly vaporize in a short period of time, produce water vapor, cover the fire source, and make the fire source unable to burn without sufficient oxygen.

According to the general knowledge we know, it is better to extinguish a fire with cold water, as cold water can quickly reduce the temperature of the fire. It is true that cold water is good for extinguishing fires, but for more effective extinguishing of fires, it is better to use hot water. For an object to think of fire, three conditions must be met:

One is to reach the ignition point; the second is the source of fire; Third, there is plenty of air. Therefore, if we want to put out the fire, we must contain it from these three aspects. Cold water can reduce the ignition point, but two other conditions can't stop it.

The use of hot water to extinguish the fire, the hot water can quickly vaporize in a short time, produce water vapor, cover the fire source, so that the fire source can not get enough oxygen and cannot burn, so hot water can curb the development of the fire from two aspects.

However, it is still important to note that you must be careful with fire in your life. Although hot water is effective in extinguishing fires, it is very difficult to get a large amount of hot water to extinguish fires in a critical moment. Why firefighters don't use hot water to extinguish fires, the time is tight, the task is heavy, and the difference is small, so it is not applicable (hot water is relatively hot and easy to hurt people).

People will be confused, do they have to divide cold water and hot water to extinguish fires? Actually, there is a scientific truth here. As we all know, the common methods of fire extinguishing are nothing more than four methods: cooling method, suffocation method, isolation method, and inhibition method.

Why is hot water more effective than cold water? An important point is that hot water is sprayed on the combustibles, not only can play a cooling role, but also the burning materials are quickly surrounded by a cloud of steam, so that the surrounding oxygen is reduced, once the fire is hypoxic, the fire must be controlled, these vapor layers play a large area of suffocation, so that the fire from strong to weak finally achieve the effect of extinguishing the fire and eliminating the disaster. Relevant information shows that if 1 kilogram of cold water is sprayed on the combustibles, the effective value of the fire extinguishing area is only one square meter, no matter how good it is.

However, with 1 kg of steam, 5 cubic meters of air can contain more than 35% water vapor and less than 14% oxygen. When the water vapor in the air reaches more than 35%, or the oxygen content in the air drops to 17%, the combustion stops, which means that no matter how big the fire is, it must be extinguished, which shows that the effect of using hot water to extinguish a fire is much stronger than that of cold water. Studies have shown that boiling water is 5 times more effective than hot water and more than 10 times more effective than cold water.

In fire extinguishing practice, 1 liter of hot water per second plays the equivalent of 20 to 30 liters of cold water. If you use boiling water to extinguish the fire, 5 firefighters can complete the workload of dozens of firefighters, and get twice the result with half the effort.