The very large heat of vaporization of water is the reason why water is particularly suitable for extinguishing a fire. When water is poured onto the fire site, the water is not only heated, but also vaporized. As explained, the water requires a great deal of heat specifically for vaporization. This energy is supplied by the fire site.
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 until it hits 212 degrees …
Why does hot water extinguish fire? – Quora
Because hot water is still way colder than the fire. Hot water absorbs a bit less energy before boiling, but not that much less. Water extinguishes fire because it has very high heat capacity (the amount of energy it must absorb to increase in temperature a given amount) and very high heat of vaporization (the amount of energy needed to convert it from a liquid to a gas).
Hot water extinguishes fire faster, as the heat that must be absorbed to convert hot water to steam is much greater than the heat absorbed in bringing cold water up to 100°c. “A fire seems to have started outside!! Quick, get me some water!” Charlie shouted. “Hot or cold, sir?” questioned the servant. “Doesn’t matter. Just get some water!”
People Also Ask why does hot water extinguish fire
Why are exactly does water put out fire so effectively?
For a fire to start or keep on burning there are three main ingredients:A fuel that will oxidize, for to burn something is to oxidize a material;Oxygen to combine with that fuel into oxidation;The adequate temperature in the fuel/oxygen mixture so that the chain reaction keeps on. …A spark! Optional, not needed if temperature is high enough.
What are 4 ways to extinguish a fire?
A home in a small southern Manitoba community was engulfed in flames Saturday afternoon, forcing five neighbouring fire departments to lend a hand to put out the blaze. Carman firefighters say they were called to a home in Roseisle — a community 20 …
Why is sometimes dumping water on a fire counterproductive?
Water sinks in grease.Burning grease reaches temperatures over 400 deg F.Water boils at 212 deg F.If you throw water on a pot of hot burning grease, the water sinks for a moment into the grease, then rapidly turns to expanding steam.The expanding steam blows the grease into the air where it combines with oxygen.
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Why washing soda not used to extinguish fire?
Why are washing soda and sulphuric acid used in fire extinguishing machine? Soda acid type extinguisher acts by cutting off supply of air. … It increases the percentage of carbon dioxide in air (CO 2 is non supporter of combustion). This type of fire extinguisher contains a bottle of sulphuric acid supported by a metallic container filled …
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Why You Definitely Don't Want To Use Water To Extinguish a Grease Fire Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher