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		<rdfs:label>Rétractation de l'air</rdfs:label>
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		<property:Applications rdf:datatype="http://www.w3.org/2001/XMLSchema#string">C’est le même principe lorsque nous allons dans le fond de la piscine et que nous avons mal aux oreilles : l’eau de la piscine pousse sur les oreilles pour y entrer car la pression y est moins forte.</property:Applications>
		<property:Complete rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Published</property:Complete>
		<property:Deepen rdf:datatype="http://www.w3.org/2001/XMLSchema#string">L'air chaud prend plus de place que l'air froid. Quand on chauffe de l'air, il prend plus de place : c'est la dilatation. Quand l'air refroidit, il prend moins de place : c'est la rétractation.</property:Deepen>
		<property:Description rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Qu'est-ce qui « appuie » sur la bouteille ?</property:Description>
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		<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''' ===
La bouteille et l'air qu'elle contient sont chauffés au contact de l'eau chaude. Une fois l'eau retirée, l'air dans la bouteille se refroidit et prend moins de place : il se rétracte. Ceci entraîne la compression de la bouteille.</property:Explanations>
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		<property:Observations rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Au bout de quelques secondes, on observe que la bouteille se "tord".</property:Observations>
		<property:Step_Content rdf:datatype="http://www.w3.org/2001/XMLSchema#string">* Mettre un peu d'eau très chaude au fond de la bouteille.</property:Step_Content>
		<property:Step_Content rdf:datatype="http://www.w3.org/2001/XMLSchema#string">* Fermer la bouteille et bien secouer, jusqu'à sentir la chaleur de l'eau au travers des parois.</property:Step_Content>
		<property:Step_Content rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Vider la bouteille et la reboucher aussitôt.

* Poser la bouteille et observer.</property:Step_Content>
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