The reason why paint can t be extinguished with water, why can t oil fire be extinguished with water

Because the boiling point of water is only 100 at room temperature and pressure, the oil will be rapidly vaporized when the water encounters high temperature, and the violent gasification process will bring the oil into the air to form an oil-water mixture, which is fully in contact with oxygen to form a deflagration.

Taking the oil pan ** as an example, when the oil pan **, the ignition temperature of the oil pan exceeds 400 degrees, and the water will boil as soon as it comes into contact with it, and it will not produce the effect of isolating the air, and splashing water will cause oil splashes, which is easier to expand the fire area.

The burning oil fire should be isolated from oxygen, if the initial strength is not large, you can use a wet towel, a wet rag, etc. to cover the fire directly on the oil pan, so that the fire can be "suffocated". Or pick up the lid and push it in horizontally from the side, cover the pan with oil, and the fire will be easily covered.

If paint**, the best way to extinguish the fire is to use a dry powder fire extinguisher. Burning.

Dry chemical fire extinguishers are effective in extinguishing paint fires because they contain chemicals that reduce the oxygen to the flame** and inhibit the combustion process. When using a dry chemical fire extinguisher, you need to keep the following points in mind:

1.Check that the fire extinguisher is within the expiration date and make sure it is working properly.

2.Unplug the safety pin of the fire extinguisher and hold the nozzle.

3.Try to stand on the back side of the wind direction and aim the nozzle at the root of the flame.

4.Stick to using a fire extinguisher until the fire is completely extinguished and make sure your surroundings are safe before leaving.

If it is a large paint fire, or an uncontrollable fire, evacuate immediately and call your local fire department for professional help.

If the fire is very large, the fire should be controlled first, first isolate the surrounding combustibles (paint), and then use the hose to spray (DC) to control the range of ** paint to prevent its flow, and then spray the upper part of the flame with the hose to reduce the fire, and after the fire is reduced, the water hose will cool down with water mist and cover the fire with a foam fire extinguisher. <>

Fuel oil or paintFuel oil or paint stored at home should never be poured with water

Foam, dry powder or 1211 fire extinguishing appliances or sand should be used for extinguishing. There are a certain amount of sulfuric acid, nitric acid, hydrochloric acid, alkali metal potassium, sodium, lithium, flammable metal aluminum powder, magnesium powder, etc.

These items are very easy to react or burn when exposed to water, and must not be extinguished with water. Chemical dangerous goods**, how to correctly choose fire extinguishing agentsMost flammable and combustible liquid fires can be extinguished with foam. Among them, water-soluble organic solvents should be extinguished with insoluble foam, such as alcohol and ether fires.

Combustible gas fires can be extinguished with carbon dioxide, dry powder and other fire extinguishing agents. Toxic gases and acids and lyes can be diluted using sprays, flowering jets or water curtains.

Because the specific gravity of oil is less than that of water and is insoluble in water, the oil pot is extinguished with water, which is easy to cause hot oil to overflow or splash, which not only cannot extinguish the fire, but also aggravates the fire and causes scalding.

Because the oil is insoluble in water, extinguish the fire with carbon dioxide or a dry chemical fire extinguisher.

Its practical dry sand extinguishing can also be used. Never extinguish a fire with water, because gasoline is much lighter than water, and the fire will flow on the surface of the water and expand the fire. The easiest way is to pounce on it with sand, first, sand can isolate gasoline from the air, and second, the specific heat of sand is very large, which can absorb a lot of heat.

Of course, you can also use fire extinguishing agent, if the fire is too big, you must call the fire alarm **119 to deal with it.

It is common knowledge that water can extinguish fires. Because combustion must meet two conditions, the first is to have enough oxygen; The second is to reach the combustion temperature ——— ignition point. When fighting fires, try to destroy these two conditions.

When extinguishing a fire with water, water can lower the temperature of the burning object, not because the temperature of the water itself is low, but because the water is sprayed on the fire and immediately turns into water vapor. When water turns into water vapor, it takes away a lot of heat, which reduces the temperature of the burning object; In addition, when water turns into water vapor, it is enveloped in the combustion body, isolating the air and cutting off the oxygen supply, so the water can extinguish the fire. If you douse water on oil when it catches fire, it would be a big mistake.

This will make the fire even bigger, like "adding fuel to the fire". Why can't oil fires be extinguished with water? It turns out that oil is lighter than water, and when water is sprayed on the oil, the water cannot cover the oil, but all sinks to the bottom of the oil layer, so it cannot isolate the oxygen of the **; In addition, the water sinks below the oil, where the temperature is lower, and the possibility of the water turning into vapor is very small, which does not help to isolate the oxygen.

In addition, the water is flowing, and it will float around with the burning oil, expanding the scope of combustion, increasing the contact area between the fire and the air, and the fire will burn more and more. Therefore, when the oil catches fire, do not use water to extinguish it. So when the oil catches fire, what is the method to deal with?

If you accidentally catch fire while stir-frying, what is the way to deal with it? Put the lid on the pot to isolate the oil from the air, and the fire will be quickly extinguished. If the gasoline drum catches fire, use a foam fire extinguisher.

As soon as the foam fire extinguisher is turned upside down, a large amount of foam is sprayed from inside, the foam contains a large amount of carbon dioxide gas, carbon dioxide will not spontaneously combust, nor does it support combustion, and it is heavier than air.

Water is not easy to conduct the temperature of the water, boiling water mainly relies on convection to conduct the temperature, remember the experiment of boiling fish in a primary school long-necked flask, the oil is boiled on the water surface.

Because oil and bai water are not miscible, and oil is lighter than water, it will float on the water. If you use water to extinguish a fire, the oil is inside the water.

Above, water does not play the role of isolating the air volume, and because there is water to support it, the surface area of the oil will be larger, so the area in contact with the air will be larger, and the fire will be larger. Therefore, you can't use water to extinguish the oil fire.

Oil is less dense than water.

will float on the surface of the water to pick up.

Burning.

PS No. The main thing is to isolate oxygen.

Oil on fire dao

Generally, sand or quilts are used.

Back cover the burning site.

When the oil pan catches fire, it will often close the lid of the pan.

Isolate oxygen. Different things on fire will have different ways to solve it.

Oil should not be used for fire.

As long as the oil is in contact with the air, it can continue to burn.

It has nothing to do with temperature.

It turns out that oil is lighter than water, and when water is sprayed on the oil, the water cannot cover the oil, but all sinks to the bottom of the oil layer.