Water makes a mess, so it cannot be used where the dumping of water would spread out burning fuel. If there was a burning oil in a kitchen, the water would spread the oil and the oil would float over the water and continue to burn, …
The water molecule doesn’t become hot enough to separate into hydrogen and oxygen and instead, has two potential actions on the fire that can put it out. Firstly, it absorbs the heat from the fire. This is the main method by which water extinguishes fire. Room temperature water is about 77 degrees Fahrenheit and water won’t become steam …
Why does water extinguish fire? – tec-science
If the water did not vaporize when pouring it on a fire, but only heated up, then the water would not draw the enormous heat energy from the fire site due to the lack vaporization. So the water would not have the cooling effect by far and could not extinguish the fire so effectively.
First, let’s look at extinguishing agents that should not be used. NFPA 484 6.3.3.5(1) specifically states that water shall not be used as an extinguishing agent on combustible-metal fires unless they are compatible with the metal because of adverse reactions and ineffectiveness. Water-based foams are not recommended because they contain water.
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How does water extinguish fire?
This is the main method by which water extinguishes fire. Room temperature water is about 77 degrees Fahrenheit and water won’t become steam until it hits 212 degrees Fahrenheit (the boiling point of water).
What happens when you add water to a fire?
If all the water you add to a fire turns to steam, you can just add more water, the steam will eventually condense into water again, which is harmless. The second way it might extinguish a fire is by smothering it.
Is it safe to put out a fire with water?
While ordinary fires of solid material are often easily extinguished with water, electrical fires, oil or liquid fires, and metal fires should never be tackled with water. You are at a high risk of harming yourself, property, and others if you do so.
What is the least likely chemical to extinguish a fire?
Humble dihydrogen monoxide or H 2 O. This, at first glance, seems to be the least likely chemical on earth to extinguish fires with. After all – it’s made up of hydrogen and oxygen both of which are highly flammable. Why doesn’t it just break down into its constituent elements and make a fire worse, rather than extinguishing it?
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher