Topic: something to think about |
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PumkinPie
Joined: 12 Dec 2009 Posts: 13
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Post subject: something to think about |
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If hydrogen is explosive and oxygen is flamable
why does water put out fire? |
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Sun Dec 13, 2009 2:51 am |
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joeodoy
Joined: 02 Feb 2009 Posts: 208
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The oxygen and hydrogen atoms in the water molecule are the product of previous combustion, and also water putting out fire is a physical reaction rather than a chemical one. This is because carbon is not active enough to displace the hydrogen in water; and water does not disintergrate easily due to the energy required to break the covalent bonding.
First way water extinguishes a fire is by cooling. This cooling process removes the heat from the fire. This is possible through water’s ability to absorb massive amounts of heat by converting to steam. Without the heat the fuel no longer has the conditions required to produce oxygen to sustain the fire. The second way water extinguishes a fire is by smothering the fire. When water is heated to its boiling point it converts to a gas called water vapor or steam. When this conversion takes place is dilutes the oxygen in the air. - Wikipedia, Firefighting.
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Sun Dec 13, 2009 6:11 am |
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sx7r
Joined: 02 Feb 2009 Posts: 186 Location: Texas
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hm. _________________
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Sun Dec 13, 2009 6:14 am |
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Fenix
Joined: 30 Jun 2009 Posts: 71 Location: at home
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Sun Dec 13, 2009 2:57 pm |
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Zebruh
Joined: 10 Dec 2007 Posts: 1537 Location: Massachusetts
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joeodoy wrote: | The oxygen and hydrogen atoms in the water molecule are the product of previous combustion, and also water putting out fire is a physical reaction rather than a chemical one. This is because carbon is not active enough to displace the hydrogen in water; and water does not disintergrate easily due to the energy required to break the covalent bonding.
First way water extinguishes a fire is by cooling. This cooling process removes the heat from the fire. This is possible through water’s ability to absorb massive amounts of heat by converting to steam. Without the heat the fuel no longer has the conditions required to produce oxygen to sustain the fire. The second way water extinguishes a fire is by smothering the fire. When water is heated to its boiling point it converts to a gas called water vapor or steam. When this conversion takes place is dilutes the oxygen in the air. - Wikipedia, Firefighting.
And you just made me realize i needa go get laid = = |
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Sun Dec 13, 2009 9:21 pm |
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TheOvahLord
Joined: 03 Dec 2009 Posts: 16
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i think what she means is its kinda funny that 2 atoms that react to fire in a bad way when you put them together they become something that puts fire out. 2 flamable atoms become non flamable when put together. i dont think you needed to explain why they do that. its jsut funny in my opinnion |
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Sun Dec 13, 2009 9:48 pm |
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Skye Site Admin
Joined: 11 Mar 2008 Posts: 777 Location: Funkytown
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TheOvahLord wrote: | i think what she means is its kinda funny that 2 atoms that react to fire in a bad way when you put them together they become something that puts fire out. 2 flamable atoms become non flamable when put together. i dont think you needed to explain why they do that. its jsut funny in my opinnion |
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Mon Dec 14, 2009 4:25 am |
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RuffleBump
Joined: 10 Jun 2009 Posts: 64
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Post subject: Atoms and reaction |
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You are right Pum, it is an interesting situation. But I have to say it is also awesome to know why things happen. In this case it is all about the reativity of the elements involved. Each atom has a reactivity, determined by the vacancy in the outer shell of the atom, and when combined the reactivity of the atoms changes. Also the actual chemical make up changes hence heat to hydrogen or oxygen alone cause fire, explosions what have you. But combine those atoms and you get steam after applying enough heat.
Okay Jo, just a small correction from above. Fuel does not put off oxygen, it actually puts off whats called combustible vapor. Each fuel has a different cumbustible vapor, ending in what is called flash point. The oxygen portion is separate fromt the fuel, you can actually get say wood to release its fuel vapor in a vaccum with heat applied and not get fire due to no oxygen. It is pretty awesome on slow motion video. Just thought I would through my two cents in.
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Tue Dec 22, 2009 5:00 pm |
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Jokerz
Joined: 11 Oct 2009 Posts: 717 Location: Cape Town, South Africa
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I feel dumb when I read this , section thingie....
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Wed Dec 23, 2009 6:42 pm |
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XVongolaX
Joined: 05 Aug 2009 Posts: 1370 Location: California
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Also, how can Dumbo fly? Even if he has those big ass ears, its physically impossible to fly with that much weight D;>
Or how do animals talk!?!?!
Or HOW DO MERMAIDS BECOME HUMAN????
Or...how do carpets fly? Besides the powers of a genie
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Wed Dec 23, 2009 8:10 pm |
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marine
Joined: 22 Jun 2009 Posts: 1389 Location: here
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XVongolaX wrote: | Also, how can Dumbo fly? Even if he has those big ass ears, its physically impossible to fly with that much weight D;>
Or how do animals talk!?!?!
Or HOW DO MERMAIDS BECOME HUMAN????
Or...how do carpets fly? Besides the powers of a genie
Cause.. genies are real <-< >->
Ive seen them. As well as santuh clus |
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Wed Dec 23, 2009 9:45 pm |
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-Ayane-
Joined: 29 Dec 2009 Posts: 21 Location: Inside your undies ;)
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This is the beauty of the chemistry 2 flamable thingy can put out fire!
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Wed Dec 30, 2009 1:07 am |
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