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		<rdfs:label>Verre qui met des collants</rdfs:label>
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		<property:Avertissement rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Retourner trop lentement le verre et l'eau se vide, verser trop rapidement l'eau et le verre ne se remplit pas.</property:Avertissement>
		<property:Complete rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Draft</property:Complete>
		<property:Description rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Mon verre muni d'un collant se remplit facilement, mais est-ce aussi simple de le vider ?</property:Description>
		<property:Difficulty rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Easy</property:Difficulty>
		<property:Disciplines_scientifiques rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Physics</property:Disciplines_scientifiques>
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		<property:Explanations rdf:datatype="http://www.w3.org/2001/XMLSchema#string">De manière simple

Quand on remplit un récipient avec de l'eau, il se forme à la surface une fine pellicule (comme une "peau de l'eau"). Cette fine pellicule permet de former un "joint" avec le collant lorsque le verre est retourné. La combinaison de cette pellicule d'eau avec la pression de l'air ambiant empêche l'eau de traverser le collant (l'air qui est à l'extérieur du verre pousse sur le collant).


Allons plus loin dans l'explication

À l'interface entre deux milieux denses (liquides ou solides), la matière n'est pas, localement, dans le même état. Ici c'est le cas avec l'interface entre les milieux EAU-AIR, où il se forme une fine pellicule qui "sépare" l'eau se trouvant dessous avec l'air, c'est la tension superficielle. Cette fine pellicule associée avec le collant forme une surface étanche.


Cette surface étanche, couplée à la pression atmosphérique exercée sur le collant, empêche l'eau de couler.</property:Explanations>
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		<property:Observations rdf:datatype="http://www.w3.org/2001/XMLSchema#string">L'eau coule dans le verre au travers du collant, mais lorsque je retourne le verre brusquement, elle ne coule plus !</property:Observations>
		<property:Step_Content rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Se munir d'un verre, d'un élastique et d'un collant. 

Recouvrir le verre du collant, bien le tendre pour que la surface soit bien lisse en sans couture, et le maintenir à l'aide d'un élastique par exemple.</property:Step_Content>
		<property:Step_Content rdf:datatype="http://www.w3.org/2001/XMLSchema#string"># Remplir le verre, doucement, que se passe t-il ? 
# Et maintenant, retourner le verre brusquement !</property:Step_Content>
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