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Topic: Why are gas leaks from a pressurised gas cylinder cold?  (Read 3000 times)

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Offline Neverquit

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Why are gas leaks from a pressurised gas cylinder cold?
« on: September 06, 2010, 09:01:02 AM »
Hi can someone please let me know why a gas leak from a pressurised cylinder is cold?
I think it has something to do with endothermic reactions. Is this correct?
Or is it do do with Kinetic theory?
Thanks in advance.
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Offline Dan

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Re: Why are gas leaks from a pressurised gas cylinder cold?
« Reply #1 on: September 08, 2010, 04:40:40 AM »
Quote from: Neverquit on September 06, 2010, 09:01:02 AM
I think it has something to do with endothermic reactions. Is this correct?

Yes, that's a good starting point. Within the cylinder the pressurised gas is a liquid, what happens to it when it leaks out of the pressurised container? Why is this endothermic?
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Offline MrTeo

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Re: Why are gas leaks from a pressurised gas cylinder cold?
« Reply #2 on: September 08, 2010, 05:45:47 AM »
Quote from: Neverquit on September 06, 2010, 09:01:02 AM
I think it has something to do with endothermic reactions. Is this correct?

As Dan wrote it's true that it is endothermic but it isn't a reaction (I suppose you meant a chemical reaction), only a physical change...
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