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Supercooled Water Nucleation Experiments
Relatively pure water cooled slowly below the freezing point may remain liquid (supercooled). It may then crystallize into ice quickly by some catalyst: here, strong vibrations, and seeding by an ice crystal.
Length: 49
Rating: 4.50 (41 ratings)
Tags: supercooling water supercool nucleation physics cloud seeding experiment
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Mountain Lecture: Nucleation
Matt attempts to explain nucleation after climbing the devil's staircase. Some of the facts may be wrong. Any video responses must be filmed atop a mountain
Length: 88
Rating: 0.00 (0 ratings)
Tags: Nucleation West Highland Way Hot Water Freezing quicker cold
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Nucleation
mentos + diet coke ;]
Length: 52
Rating: 0.00 (0 ratings)
Tags: mentos diet coke
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Physics of Nucleation
Just a quick project I threw together with my friends for physics. Thank you to youtube for the movies to create this movie. Anyway, enjoy, I'd say it's at least kinda funny.
Length: 134
Rating: 0.00 (0 ratings)
Tags: nucleation jon funny project physics
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Some Backflips
Self Taught --Pointers
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Vegetable (non-dairy) fats are used extensively as fat sources in ice cream in the United Kingdom, parts of Europe, the Far East, and Latin America but only to a very limited extent in North America. Five factors of great interest in selection of fat source are the crystal structure of the fat, the rate at which the fat crystallizes during dynamic temperature conditions, the temperature-dependent melting profile of the fat, especially at chilled and freezer temperatures, the content of high melting triglycerides (which can produce a waxy, greasy mouthfeel) and the flavor and purity of the oil. It is important that the fat droplet contain an intermediate ratio of liquid:solid fat at the time of freezing. It is difficult to quantify this ratio as it is dependent on a number of composition and manufacturing factors, however, 1/2 to 2/3 crystalline fat at 4-5oC is a good, working rule. Crystallization of fat occurs in three steps: undercooling to induce nucleation, heterogeneous or homogeneous nucleation (or both), and crystal propagation. In bulk fat, nucleation is predominantly heterogeneous, with crystals themselves acting as nucleating agents for further crystallization, and undercooling is usually minimal. However, in an emulsion, each droplet must crystallize independently of the next. For heterogeneous nucleation to predominate, there must be a nucleating agent available in every droplet, which is often not the case. Thus in emulsions, homogeneous nucleation and extensive undercooling may be common. Blends of oils are often used in ice cream manufacture, selected to take into account physical characteristics, flavor, availability, stability during storage and cost.
Length: 71
Rating: 5.00 (2 ratings)
Tags: golf action american football martial arts hockey track field water sport winter sports motor baseball basketball talk soccer combat extreme tennis
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HISTORY OF WINTER - Lake Ice Tells a Story
http://www.blueiceonline.com/howsite/lakeice_about.html
Lake ice cover is seasonal and occurs where average daily temperature is below the freezing point. Once formed the lake ice thickens over the course of the winter as the temperature gets colder. The lakes thermal structure prepares for ice with 0 degrees celsius water at the surface and denser 4 degrees celsius at the bottom. Once meteorologic conditions provide colder air, relative to warmer water, the water does not get colder - instead ice forms.
CONGEALATION ICE is frozen lake ice and forms as two major types.
(1)Spontaneous Nucleation takes place on cold calm nights when the surface of the lake supercools (i.e. - the temperature drops below freezing) and the ice nucleates -- spreading rapidly across the lake ice surface. The 'c' axis of the ice crystals are oriented vertically. Individual crystals can reach meter wide dimensions.
(2)Heterogeneous Nucleation takes place when lake conditions are cold enough and strong winds blowing dust, snow or frozen rain hit the lake surface and the cause nucleation. The ice grows with the 'c' axis of the ice crystals in the horizontal direction. In this case columnar crystals are formed. These ice crystals take on a colorful tint when viewed in polarized light.
SNOW ICE occurs when snow falls on congealation ice and when thick enough the ice cracks and water rushes to wet the snow which will then freeze. The frozen snow ice is finely crystalline and easily recognized.
To the naked eye it is difficult to discern any details among various samples of ice except for the presence of trapped air bubbles. However, when a thin section of ice is sandwiched between 2 polarizer sheets on a light table the secret world of ice is revealed. The size, shape and orientation of the individual crystals are exposed in a kaliedoscope of color and shape. As a teacher, the use of ice in hands on experiments provides limitless educational possibilities.
Length: 193
Rating: 0.00 (0 ratings)
Tags: IPY SNOW ICE POLAR ALASKA CRYOSPHERE CLIMATE CHANGE INDIGENOUS SNOWFLAKE SNOWCHANGE
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DIET COKE AND MENTOS BALCONYTV.COM 03/09/2006
It is possible to cause a sudden high-pressure release of carbon dioxide by inserting multiple Mentos into a container of Diet Coke. Mythbusters found this is caused becuse of nucleation as well as certain catalysts in the Diet Coke and Mentos themselves. The phenomenon is described in some detail by the General Chemistry Online! FAQ, which also attributes it to nucleation.
This does not appear to work with the Australian formula of the product. While there is a release of carbon dioxide similar to that observed on Mythbusters, the effects are nowhere near as spectacular.
Presented by Tom Millett
http://antoine.frostburg.edu/chem/senese/101/consumer/faq/mentos.shtml
Length: 140
Rating: 3.20 (13 ratings)
Tags: balconytv.com balcony tv diet coke mentos experiment dame street dublin ireland
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CoronaFreeze
1. Get a nice carbonated beverage that comes bottled in a smooth glass bottle.
2. Put it in the freezer for a couple hours and get it cold (but don't freeze it).
3. If the bottle is truly smooth, the liquid will want to freeze, but will be unable to; the ice crystals need small defects in the glass (or particles in the liquid) on which to nucleate.
4. Bang or open the bottle. The bubbles that come out of solution will serve as nucleation sites for the ice crystals. Ice crystals will begin to form on them!
Videos of this phenomenon have been floating around on the Internet, but John and I wanted to try it ourselves!
====== Music Credits =====
Title: Casino Royale (from trailer)
Composer: David Arnold and Nicholas Dodd
Title: Opening music from Perfect Dark (video game)
Composer: Grant Kirkhope
Length: 29
Rating: 5.00 (12 ratings)
Tags: corona freeze funskits bubbles nucleation ice crystals
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