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23-11-2007, 19:54
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Absinthe
Join Date: Jul 2006
Location: Cornwall
Posts: 2,692
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Phun Physics...
I saw this done last year, and Clare reminded me about it by talking about freezing boiling water...
http://www.youtube.com/watch?v=fSPzMva9_CE http://www.youtube.com/watch?v=EODql2ef6iQ Basically, if pure water is chilled slowly to a low temperature (below freezing), there are no impurities to act as a nucleation centre for ice crystals to start growing. If the water is disturbed too much, then a nucleation point occurs and the whole mass of water will solidify in seconds, leading to much merriment. I've yet to replicate the situation myself as the school freezer is too cluttered to leave the water undisturbed and I've yet to find a good brand to try it with. |
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23-11-2007, 19:58
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Deep Throat
Join Date: Jul 2006
Posts: 6,512
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NERD!
Hehehehehheheheheeehe! Loving it though! Wanna do it! And then do some phun physics stuff  
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23-11-2007, 20:06
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The list is long, but distinguished
Join Date: Dec 2006
Location: Århus, Denmark
Posts: 1,643
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Very cool!
This reminds me of 'freezing rain', something most pilots of small aircraft dread to encounter. It has a great ability to kill engines, visibility and lift.
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23-11-2007, 20:12
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Deep Throat
Join Date: Jul 2006
Posts: 6,512
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Quote:
I just booked my place in hell 
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23-11-2007, 20:15
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The list is long, but distinguished
Join Date: Dec 2006
Location: Århus, Denmark
Posts: 1,643
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Quote:
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23-11-2007, 21:51
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Joey Tempest
Join Date: Sep 2007
Location: Gravesend.
Posts: 2,751
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That is pretty cool!
Would something similar work with pure ethanol? Say you chilled that to -20 or something, and then poured cold water in... Actually, now I've written it down the water would just dilute the ethanol as -20 isn't cold enough to cause instant freezing of water. Maybe if you chilled the ethanol down to -100 
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23-11-2007, 22:01
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Abandoned Ship
Join Date: Jul 2006
Posts: 335
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i love physics (ionising radiation is where it's at
)but, isn't this more chemistry? bond making, bond breaking, latent heat of fusion / evaporation, and all that? Last edited by goldilocks; 23-11-2007 at 22:01. Reason: embarrassingly awful spelling |
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23-11-2007, 22:18
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I'm going for a scuttle...
Join Date: Jul 2006
Posts: 2,021
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23-11-2007, 22:21
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Joey Tempest
Join Date: Sep 2007
Location: Gravesend.
Posts: 2,751
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Quote:
I never liked physics, I was good at it when it came down to it but at the time of choosing what to do I dropped that one.
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24-11-2007, 00:04
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Moonshine
Join Date: Sep 2007
Location: Southampton
Posts: 3,201
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Physics was easier than Chemistry at A Level, so I took that one.
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