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Science! (video - fluid simultaneously boils and freezes?)
YouTube.com ^ | 3-30-2014 | Tom Enstone

Posted on 03/31/2014 12:13:14 AM PDT by servo1969

Published on Mar 30, 2014

Evacuating a sample of unknown fluid (to vaporize for mass spectrometry).
Pressure drop causes a decrease in temperature.
The fluid simultaneously both boils and freezes?
Would like some insight here...


TOPICS: Arts/Photography; Chit/Chat; Education; Science
KEYWORDS: point; science; triple
What sorcery is this?

Any ideas?

1 posted on 03/31/2014 12:13:14 AM PDT by servo1969
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To: servo1969
Sir Bedevere: ...and that, my liege, is how we know the Earth to be banana shaped.
King Arthur: This new learning amazes me, Sir Bedevere. Explain again how sheep's bladders may be employed to prevent earthquakes.
2 posted on 03/31/2014 12:16:05 AM PDT by servo1969
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To: servo1969

My blood does that all the time.


3 posted on 03/31/2014 12:17:00 AM PDT by PastorBooks
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To: servo1969

triple point?


4 posted on 03/31/2014 12:21:16 AM PDT by Ray76 (Profit from the mistakes of others, you'll never live long enough to make them all yourself.)
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To: servo1969

Gonna guess it’s at the triple point, and solid, liquid and vapor are in equilibrium under the substance’s own vapor pressure. When the vapor is evacuated by the vacuum pump the decrease in pressure temporarily takes us off the TP, which causes some of the solid to liquefy, and some of the liquid to vaporize, restoring equilibrium.


5 posted on 03/31/2014 12:22:01 AM PDT by FredZarguna (Das ist nicht nur nicht richtig, es ist nicht einmal falsch!)
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To: servo1969

Vapor pressure, without air pressure the fluid begins to undergo sublimation and bubbles.
Without air, the temperature drops rapidly and it freezes.

And then the videographer gets turned into a newt!


6 posted on 03/31/2014 12:23:24 AM PDT by Darksheare (Try my coffee, first one's free..... Even robots will kill for it!)
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To: servo1969
I guess the fluid has a fairly high freezing point when pressure is low. So evaporating liquid carries away heat, cooling the rest of the sample. Might be similar to the Mpemba effect
7 posted on 03/31/2014 12:24:02 AM PDT by MetaThought
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To: Darksheare

I hope he gets better.


8 posted on 03/31/2014 12:26:12 AM PDT by Vince Ferrer
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To: Vince Ferrer

Well, now he’s in trouble because he currently weighs as much as a duck.


9 posted on 03/31/2014 12:28:28 AM PDT by Darksheare (Try my coffee, first one's free..... Even robots will kill for it!)
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To: Vince Ferrer

But, what also floats?

Wood? Leaves? Very small rocks?


10 posted on 03/31/2014 12:29:20 AM PDT by F15Eagle (1Jn4:15;5:4-5,11-13;Mt27:50-54;Mk15:33-34;Jn3:17-18,6:69,11:25,14:6,20:31;Ro10:8-11;1Tm2:5-6;Ti3:4-7)
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To: servo1969

Formic acid would show a triple point at about 8 degrees C under a fairly good vacuum. I’m sure there are other organic compounds which would be even easier to manage.


11 posted on 03/31/2014 12:46:09 AM PDT by HiTech RedNeck (Embrace the Lion of Judah and He will roar for you and teach you to roar too. See my page.)
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To: Darksheare
Simple.. It's Chrisy Mathews brain. On the rare occasion that he attempts a rational thought his brain undergoes this phenomena which creates undue pain-in-the-brain causing him to immediately disengage from that activity..

Thereby allowing him to continue to spew nonsensical drivel while slobbering all over his microphone...

12 posted on 03/31/2014 12:49:18 AM PDT by NoCmpromiz (John 14:6 is a non-pluralistic comment.)
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To: NoCmpromiz

I thought pierced moron had the distinction of direct cranial sublimation?


13 posted on 03/31/2014 1:05:00 AM PDT by Darksheare (Try my coffee, first one's free..... Even robots will kill for it!)
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To: HiTech RedNeck

Acetone with pine resin dissolved into it reacts violently to a drop in pressure.


14 posted on 03/31/2014 1:07:28 AM PDT by Darksheare (Try my coffee, first one's free..... Even robots will kill for it!)
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To: servo1969

Sounds a good many women I know...


15 posted on 03/31/2014 1:57:32 AM PDT by Vendome (Don't take life so seriously-you won't live through it anyway-Enjoy Yourself ala Louis Prima)
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To: servo1969

It could be explained by time-lapse photography with unknown pressure and temperature changes using any number of fluids. Notice that you do not see any “outside” reference movement that you would recognize, such as a human being.


16 posted on 03/31/2014 3:20:08 AM PDT by Pecos (The Chicago Way: Kill the Constitution, one step at a time.)
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To: servo1969

Believe it of not, I’ve actually done this boil/freeze thing.
I needed to fill capillary tubes with water and the capillary tubes were so small the water couldn’t overcome the surface tension to enter the tube. We put the tubes in a container of water, drew a vacuum and the water filled the tubes while boiling. This was delicate because the instant the water froze, from heat of vaporization loss, the tubes would break because the water would expand. We wound up using a 5 or 6 percent alcohol mix that kept the freezing from occurring.


17 posted on 03/31/2014 5:01:33 AM PDT by BuffaloJack (Freedom isn't free; nor is it easy. END ALL TOTALITARIAN ACTIVITY NOW.)
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To: servo1969

Critical point
http://en.wikipedia.org/wiki/Critical_point_(thermodynamics)

18 posted on 03/31/2014 5:08:01 AM PDT by thackney (life is fragile, handle with prayer)
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To: servo1969

19 posted on 03/31/2014 6:13:02 AM PDT by JRios1968 (I'm guttery and trashy, with a hint of lemon. - Laz)
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