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As I say I do not remember exactly what the science was but I remember doing the calculations.
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Not saying that energy loss has momentum, but technically, fluid temperature is very closely related to the average momentum of the water molecules - if I recall correctly, temperature (being a measure of internal water energy) is proportional to the average kinetic energy of the water molecules (or something along those lines), which in turn is proportional to the average of the square of the molecules' momentum.
So I would say that heated water, having a higher average molecular kinetic energy, exchanges higher amounts of energy with its environment, therefore in turn loses more energy to it (and cools faster).
Then again, I may be wrong in that. I seem to have forgotten most of the thermodynamics I've been taught.
Φευ! Εδόμεθα υπό ρηννοσχήμων λύκων!
(Alas! We're devoured by lamb-guised wolves!)
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H.Brydon wrote: Not quite "the Mpemba effect"
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
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Was gonna post this, but I was beaten to it. Good link.
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it is actually so that hot water freezes more quickly than cold water, although it is not yet known why.
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V. wrote: ...although it is not yet known why.
Yes it is ... see my previous reply in this thread.
Never moon a werewolf.
- Harvey
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Boiling water to snow[/\]chemistry.about wrote: This science trick is as easy as throwing boiling water into the air and watching it instantly change into snow.
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That is freaky! I think I prefer the regular quakes we have here in Southern California.
Soren Madsen
"When you don't know what you're doing it's best to do it quickly" - Jase #DuckDynasty
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yes, it's real. and my FB feed is currently full of people demonstrating that it works in their back yards.
cold air, pot full of hot water => snow
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More to the point: given the amount of snow they already have, why are they adding any blooming more?
Never underestimate the power of stupid things in large numbers
--- Serious Sam
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Don't forget we use Fahrenheit so -15 here is a lot colder than -15 there : )
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Yeah. Imagine if it was -40! How much colder would that be?
Never moon a werewolf.
- Harvey
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It works - really! A couple of points, though... The liquid immediately separates into droplets, vastly increasing the surface area exposed to the cold, plus it is moving, effectively the same as a stiff breeze. Both factors contribute to the rapid freezing. Besides, it's been really, really cold. It was so cold, in fact, that Miley Cyrus stuck to her wrecking ball, and a Liberal in D.C. was spotted with his hands in his own pockets!
Will Rogers never met me.
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Roger Wright wrote: and a Liberal in D.C. was spotted with his hands in his own pockets!
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These were American Yuppies throwing the water, so they used Perrier VSOP Vergèze Extra Lite, which retails for US $50 per liter. That vintage boils at only 60C.
“There are obvious things, and there are many obvious things no one tried, because no one needed to try them.” Sergey Alexandrovich Kryukov, January 1, 2014
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The freakiest thing I've seen was yesterday morning.
I have a tarp on the garage floor to catch the caked snow that falls off the car at night in a pathetic effort to stop the foul black melt from flowing over everything else I have stacked in the garage. In the morning there's a pool of water at the garage door from the melt, and when I open the door it flows outside. I always get a broom and sweep it out of the way into a nearby (2 feet away) drain so I don't get a thicker and thicker ice slab building up.
Yesterday, as I swept the water from the garage it almost immediately thickened, went slushy, then granular, and then within half a foot of the drain I was no longer pushing water but rolling a log of cookie-dough consistency frozen slush about 3 inches wide. Time was about 5-10 seconds from running water to the cookie dough event horizon.
Back home to Australia in 4 weeks. Can. Not. Wait.
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You guys have the weirdest things going on up there. In a disturbing way, I am almost jealous. Almost.
Great, now I want cookies.
Soren Madsen
"When you don't know what you're doing it's best to do it quickly" - Jase #DuckDynasty
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I heard it is 120 degrees Fahrenheit / 49 degrees Celsius in Australia. No comfy in between temperatures.
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120F?
Sounds comfy to me!
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