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Firefighters in many places have embraced the use of “wetting agents” as part of their everyday operational tactics. In order to be more efficient in their work of distinguishing fires, they have recently started adding certain chemicals to the water. This results in breaking down the surface tension of the water, thus making it a \u201cwetter\u201d liquid. <\/strong><\/p>\n\n\n\n These chemicals cause the outer surface or \u201cskin\u201d of the water to break with greater ease, and in this manner also permits the water to penetrate into objects more readily. The principal value of water in extinguishing a fire is its cooling effect. <\/strong>Cooling is obtained largely by absorbing heat from the burning material, and the major part of this takes place when the liquid is turned into steam vapor. The mass of water that actually contacts the burning material is what really counts, and wetness usually increases this area of contact, and, consequently, the rate of heat transfer. <\/p>\n\n\n\n