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As good as water is, it isn't perfect. It has some drawbacks:Water can't be used if the temperature of the water is reduced below 32 degrees F. Water conducts electricityThis is true, but electrical conductivity is not as much of an issue as it is sometimes made out to be. There are methods of application and equipment available that allows the careful application of water on an electrical fire. Water can cause irreversible damage to some items. In the case of flammable liquidsWhen applied in large streams, or in sprays using large droplets, water may not be effective, especially if the flammable liquid floats on water, such as a hydrocarbon., water may not be effective. Water can cause some severe chemical reactionsFor example, you don't put water on a magnesium fire, as it will enhance the burning rate of the material, making for a hotter fire. There are a number of chemicals that will react violently with water. when applied to some metals and chemical fires.
A word about water and delicate electrical equipment...
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