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Topic: Vapourisation (Read 7284 times)
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prasannab13
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Vapourisation
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on:
June 16, 2008, 09:45:23 AM »
How does rapid vapourisation results in lowering of the liquid temperature? And how this principle i sused in liquification of air or real gases? PLEASE anyone can help me
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Borek
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Re: Vapourisation
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Reply #1 on:
June 16, 2008, 10:52:38 AM »
Where does the energy required for boiling come from?
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ChemBuddy
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prasannab13
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Re: Vapourisation
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Reply #2 on:
June 16, 2008, 12:48:27 PM »
Quote from: Borek on June 16, 2008, 10:52:38 AM
Where does the energy required for boiling come from?
Heat energy is provided from external source.
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Borek
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Re: Vapourisation
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Reply #3 on:
June 16, 2008, 01:35:04 PM »
What if there is no external source? Imagine you have water at 50 deg C and you put it into vacuum. Water boils, if you have ever used vaccum filtration you may have seen that. Where does the necessary heat comes from?
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ChemBuddy
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prasannab13
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Re: Vapourisation
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Reply #4 on:
June 16, 2008, 09:06:23 PM »
Heat comes from collision of liquid particles among themselves.
Is the reason correct or not?
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Borek
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Re: Vapourisation
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Reply #5 on:
June 17, 2008, 03:16:08 AM »
No, it is wrong. Collisions are not form of energy. You are looking for a heat source. Heat is a form of energy, so you have to look for other forms of energy present. You are close, but you are wrong.
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ChemBuddy
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prasannab13
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Re: Vapourisation
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Reply #6 on:
June 17, 2008, 09:42:46 AM »
I think energy comes from kinetic energy of molecules.Am i correct?
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Borek
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Re: Vapourisation
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Reply #7 on:
June 17, 2008, 10:28:32 AM »
Very good. Now, do you know how the kinetic energy of molecules is related to temperature? Do you know what will happen to temperature when you will use some of the molecules kinetic energy?
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ChemBuddy
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prasannab13
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Re: Vapourisation
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Reply #8 on:
June 17, 2008, 12:38:54 PM »
THANKS Borek for the help.I understood it.
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