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If materials known as dry chemicalsThe "original" dry chemical was sodium bicarbonate, better known as "baking soda." Derivatives of baking soda are still used widely today in dry chemical systems and handheld extinguishers. are applied to a fire, the following mechanisms may be involved to suppress the fire:chemical interaction with the flame of the fire coating the material that is on fire possibly cooling the flame providing a coating over the material so that the radiation effect of heat transfer can't occur
There is another similar family, known as wet chemicals, that are primarily used in commercial kitchen range hood applications. They tend to be a better suppression agent for today's "high-tech" cooking oils.
A word regarding dry chemical extinguishing...
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