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Topic: Vapourisation  (Read 6985 times)

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Offline prasannab13

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Vapourisation
« 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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Offline Borek

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Re: Vapourisation
« Reply #1 on: June 16, 2008, 10:52:38 AM »
Where does the energy required for boiling come from?
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Offline prasannab13

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Re: Vapourisation
« 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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Offline Borek

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Re: Vapourisation
« 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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Offline prasannab13

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Re: Vapourisation
« 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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Offline Borek

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Re: Vapourisation
« 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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Offline prasannab13

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Re: Vapourisation
« 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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Offline Borek

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Re: Vapourisation
« 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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Offline prasannab13

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Re: Vapourisation
« Reply #8 on: June 17, 2008, 12:38:54 PM »
THANKS Borek for the help.I understood it.
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