Surfusion de l'eau

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Description:
La surfusion est due à l'énergie de tension superficielle à l'interface solide-liquide. De manière simplifiée, on peut considérer que dans un liquide libre d'impuretés, les petits germes de [...]


Description:
La surfusion est due à l'énergie de tension superficielle à l'interface solide-liquide. De manière simplifiée, on peut considérer que dans un liquide libre d'impuretés, les petits germes de solide en voie de congélation sont instables car ils sont refondus par l'agitation thermique. Plus rigoureusement, l'énergie libérée par la solidification (chaleur latente de fusion) ne compense pas l'énergie dépensée pour créer l'interface solide-liquide. Le liquide continue donc à se refroidir sans solidifier. Cet état peut être déstabilisé par l'ajout d'impuretés microscopiques pouvant servir de noyaux de condensation, ou par un brassage qui stimule la formation de cristaux suffisamment gros pour ne pas refondre.


Video added on: 04-24-2007 at 05:27:46 pm
Categories: Education Sciences Television
Keywords: eau bouteille physique surfusion sublimation etat gazeux purete

Language: French
Shooting location: n/a


Video address: http://www.kewego.com/video/iLyROoaftj-j.html
Add this video to your blog or website (Copy/paste the HTML text below) :
sympa l azote liquide - Posted by weedax94 on 15-09-2007 17:39:44
le bol est refroidi a -40 lol
OUAAAH !!!!!!! - Posted by maxim51 on 02-09-2007 08:58:53
comment on peut faire ca nous ? quelqu'un peu m'expliquer j'veu épater mes pots .MERCI
a priori - Posted by fomblard [Go to Videoblog] on 13-05-2007 03:29:24
A priori c'est de l'eau pur, et dans ce cas ,elle peut être refroidit en dessous de 0° Celsius et restait liquide, et donc si tu agites l'eau (voire le brassage de l'explication) elle gèle.
Enfin je pense.
wow!!!! - Posted by biskuitdf65 [Go to Videoblog] on 01-05-2007 16:09:35
commestible ou pas???? sa donne des idées de coktails tous sa!!!!

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