water and fire wallpapers

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to sustain fire, it is true that you need the tri-factor of oxygen,fuel, and heat. however extinguishing fire through the use of water, is different than one would think. indeed, water sucks energy in order to change its phase, and thus reduces the heat factor, but the real crux lies in the water expansion properties. water is heavier than hot air, and as such sinks down into the fire. water vs fire wallpaper. it is at the base of the fire that most of the work is done. the water is heated up, granted, this takes up some heat, but most important of all, it turns into vapor. by the virtue of this process water expands by a factor of 300

the reasons water is to be avoided when dealing with electric fires or chemical fires are numerous, in electric fires, the main concern is, that there is live wires in the vicinity, and using water might actually increase the affected area, and create additional victims/problems. and in chemical fires, a lot of burning agents/accelerators are lighter than water (oils for example), thus using water might actually increase the perimeter by convecting flammables out of containment, and into an oxygen-rich environment. water vs fire wallpaper. then some chemical agents, when burned and introduced to vapor might become airborne in forms of aerosol, while these usually do not burn as such, they can be hazardous on their own as toxins etc.

water does not, in general, help extinguish a fire. typical fires, however, can be successfully attacked using water alone, as it can cool the fuel at the base of the fire or generate a vapor barrier between atmospheric oxygen and the hot fuel. water can accelerate liquid hydrocarbon fires by dispersing fuel. water can generate explosive gaseous mixtures when applied to some charcoal fires. water vs fire wallpaper. water can react with some metals and chemicals to directly accelerate the fire. water exothermically reacts with nuclear fuel element cladding under accident conditions to generate explosive hydrogen. water vs fire wallpaper. hot water versus cold would likely not matter, as the latent heat of vaporization will dominate the heat necessary to elevate cold water of a given temperature to some higher temperature (above the saturation point). in the case that oxygen removal is more important than cooling the seat of the fire, hot water might be more effective.

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