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		<rdfs:label>Libre comme l'air comprimé</rdfs:label>
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		<property:Applications rdf:datatype="http://www.w3.org/2001/XMLSchema#string">A part la plongée sous-marine, il y a d'autres applications de l'air comprimé :
* Gonflage de [http://fr.wikipedia.org/wiki/Pneu pneus]
* Alimentation énergétique d'outils (visseuses, tournevis, agrafeuses pneumatiques...)</property:Applications>
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		<property:Deepen rdf:datatype="http://www.w3.org/2001/XMLSchema#string">=== '''Allons plus loin dans l'explication''' ===
En plongée sous-marine, l'air comprimé est utilisé pour la respiration sub-aquatique, à l'aide de [http://fr.wikipedia.org/wiki/Bouteille_de_plong%C3%A9e bouteilles] contenant généralement entre 12 et 15 litres d'air comprimé à 200 bars.

L'air comprimé à l'intérieur de ces [http://fr.wikipedia.org/wiki/Bouteille_de_plong%C3%A9e bouteilles] n'est pas froid. On augmente la pression de l'air pour diminuer son volume, tout en conservant la même température.</property:Deepen>
		<property:Description rdf:datatype="http://www.w3.org/2001/XMLSchema#string">CO
Libre comme l'air comprimé

Un plongeur utilise une bouteille d'air afin de pouvoir rester sous l'eau. Cet air doit être comprimé afin de ne pas prendre beaucoup de place.</property:Description>
		<property:Difficulty rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Easy</property:Difficulty>
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		<property:Duration rdf:datatype="http://www.w3.org/2001/XMLSchema#double">20</property:Duration>
		<property:Duration-2Dtype rdf:datatype="http://www.w3.org/2001/XMLSchema#string">minute(s)</property:Duration-2Dtype>
		<property:Explanations rdf:datatype="http://www.w3.org/2001/XMLSchema#string">* Au contact du froid, l'air à l'intérieur de la bouteille s'est comprimé. Il occupe un volume moindre (il prend moins de place) qu'à la température ambiante.
* Au contact de la chaleur, l'air à l'intérieur de la bouteille s'est dilaté (il prend plus de place). Le volume occupé par l'air dans la bouteille a été augmenté en élevant sa température.</property:Explanations>
		<property:Item rdf:resource="&wiki;Bocal"/>
		<property:Item rdf:resource="&wiki;Eau"/>
		<property:Item rdf:resource="&wiki;Bouteille_de_verre"/>
		<property:Item rdf:resource="&wiki;Bouilloire"/>
		<property:Item rdf:resource="&wiki;Ballon_de_baudruche"/>
		<property:Licences rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Attribution (CC-BY)</property:Licences>
		<property:Observations rdf:datatype="http://www.w3.org/2001/XMLSchema#string">* Au froid, le ballon rentre dans la bouteille.
* Lorsqu'on met la bouteille dans l'eau chaude, le ballon sort de la bouteille et se gonfle.</property:Observations>
		<property:Step_Content rdf:datatype="http://www.w3.org/2001/XMLSchema#string">ci-dessus</property:Step_Content>
		<property:Step_Content rdf:datatype="http://www.w3.org/2001/XMLSchema#string">* Ajuster le ballon sur le goulot de la bouteille</property:Step_Content>
		<property:Step_Content rdf:datatype="http://www.w3.org/2001/XMLSchema#string">* Mettre l'ensemble au congélateur pendant au moins 10 minutes.</property:Step_Content>
		<property:Step_Content rdf:datatype="http://www.w3.org/2001/XMLSchema#string">* Faire bouillir de l'eau.</property:Step_Content>
		<property:Step_Content rdf:datatype="http://www.w3.org/2001/XMLSchema#string">* Sortir la bouteille du congélateur : le ballon se trouve à l'intérieur de la bouteille.</property:Step_Content>
		<property:Step_Content rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Disposer la bouteille dans l'eau chaude.</property:Step_Content>
		<property:Step_Title rdf:datatype="http://www.w3.org/2001/XMLSchema#string">L'expérience en vidéo</property:Step_Title>
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		<property:VideoType rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Youtube</property:VideoType>
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