Which fires cannot be saved with water

Incompatible with fire and water. When you encounter a fire, you immediately think of using water to fight it out. However, some fires cannot be extinguished with water.

The first is the precious paintings and calligraphy and cultural relics, important archives, etc., once the fire is caught, do not use water to fight it out. Because water will stain these valuable cultural relics, causing irreparable losses.

The second is that flammable liquids that are lighter than water should not be used to put out a fire after a fire, because the flammable liquid on fire will float on the surface of the water and flow around, causing the fire to spread.

The third category is that high-voltage electrical equipment can not be used to fight fire in case of fire. The first is that water has electrical conductivity and can easily cause short-circuit and burn of electrical equipment. The second is that high-voltage current is easily transmitted to the fire equipment along the water column, causing firefighters to get an electric shock and cause casualties.

The fourth category is that sulfuric acid, nitric acid, and hydrochloric acid cannot be extinguished with water in case of fire, because these three strong acids will undergo a strong exothermic reaction when they are in water, causing strong acids to splash around and even explode.

The fifth category is metal potassium, sodium, lithium and flammable aluminum powder and manganese powder. In case of fire, do not use water to extinguish them, because they will chemically react with water to generate a large amount of flammable gas-hydrogen, which is not only a fire "Oil" is added, and it is very easy to explode.

In addition, you can't use water to extinguish the fire when the calcium carbide is on fire, because the calcium carbide will generate flammable gas acetylene when it meets water. After mixing with the oxygen in the air, it will easily explode when it is exposed to fire.