Chemicals that cannot be extinguished with water are:
1. Alkali metal
Alkali metal elements are the general names of the metal elements in the first column of the periodic table: lithium, sodium, potassium, rubidium, cesium and francium. This kind of metal element has very active chemical properties. It can react with oxygen in the air at room temperature, and it will burn violently under heating conditions. Moreover, it will react rapidly with water to generate hydrogen and release a lot of heat, and even ignite hydrogen to explode.
2. Calcium carbide
The chemical name of calcium carbide is calcium carbide, white crystal, and industrial product is gray black block. It is an important basic chemical raw material. It is mainly used to produce combustible gas acetylene, which is not combustible, but reacts violently with water to generate acetylene and emit a lot of heat. Acetylene is easy to react with oxygen in the air to release a lot of heat.
3. Triethyl aluminum
Colorless liquid, mainly used in organic synthesis and as rocket fuel. It has active chemical properties and can spontaneously ignite in air. It reacts with water to produce combustible gas ethane and gives off a lot of heat, which will cause explosion.
4. Flammable liquid with less density than water and insoluble in water
Gasoline, kerosene, benzene and vegetable oil in the kitchen are more common. Due to their lower density than water and insoluble in water, when burning, water is often ineffective and even leads to fire spread. If a small amount of vegetable oil burning at home can be covered with pot cover.
Some chemicals that cannot be put out with water are introduced above. Because of the particularity of these chemicals, the method of fighting is very complicated. In case of fire in the warehouse where such chemicals are stored, the fire department must be informed as soon as possible, and the type and quantity of chemicals stored shall be informed.
These things are on fire and cannot be put out with water.
1. Cooking oil pot. When the oil pan is on fire, never pour it with water. Because water will form a "frying pan" when it meets hot oil. Make the oil fire splash everywhere. To put out the fire, quickly pour the cold dishes into the pot along the edge, and the fire will automatically extinguish. Another method is to cover the oil pan on fire with a pot cover or a large piece of wet cloth that can cover the oil pan, so that the burning oil fire will not contact the air, and will extinguish itself due to lack of oxygen.
2. Electrical appliances. In case of fire, cut off the power supply first. Never be able to use water and foam to save water without power failure, because water and foam can conduct electricity. Carbon dioxide, dry powder fire extinguisher or dry sand soil should be selected for fire fighting, and the distance from electrical equipment and wires should be more than 2 meters.
3. When the computer is on fire, the power should be pulled off immediately and the dry powder or carbon dioxide fire extinguisher should be used to put out the fire. If found in time, you can also unplug the power supply and quickly cover the computer with a wet carpet or quilt. Do not pour water on the computer on fire, because the sudden drop in temperature will also cause the computer to explode.
4. Fuel oil and paint. When fuel oil or paint is on fire, use foam, dry powder or 1211 fire extinguisher or sand to fight.
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