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	<owl:Ontology rdf:about="https://www.wikidebrouillard.org/wiki/Special:ExportRDF/Air_-3A_bouclier_invisible">
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		<rdfs:label>Air : bouclier invisible</rdfs:label>
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		<property:Animation rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Cette expérience peut être une première expérience autour de l’air. On peut, par exemple, après cette expérience s'intéresser à la bougie dans le bocal pour mettre en évidence que la nature n’aime pas le vide et cherche toujours à le combler.</property:Animation>
		<property:Applications rdf:datatype="http://www.w3.org/2001/XMLSchema#string">La cloche de plongée fonctionne sur ce principe. En s’assurant, pendant toute la descente, que la cloche reste verticale, l’eau ne peut pas rentrer et on garde un stock d’air important à l’intérieur de la cloche.</property:Applications>
		<property:Avertissement rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Que le mouchoir tombe dans l'eau

Que l'eau s'infiltre dans le verre</property:Avertissement>
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		<property:Deepen rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Avant de le plonger dans l'eau, le verre est, en plus du mouchoir, rempli d'air.

Lors de l'immersion, l'air présent dans le verre reste bloqué à l'intérieur. Mais si l'air ne parvient pas à s'échapper, l'eau ne peut pas non plus remonter dans le verre, c'est pourquoi le mouchoir reste sec.

Pendant l'expérience, le verre est placé dans l'eau à la verticale. Si on l'incline progressivement, l'air bloqué à l'intérieur s'échappe : on observe des bulles qui remontent vers la surface.

L'air est donc moins dense que l'eau, et non soluble avec celle-ci.</property:Deepen>
		<property:Description rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Plonger du papier ou un mouchoir sous l'eau sans le mouiller ?</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">Mechanics</property:Disciplines_scientifiques>
		<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">Lorsqu'on plonge le verre dans l'eau, l'air bloqué à l'intérieur empêche l'eau de remonter dans le verre pour mouiller le mouchoir.</property:Explanations>
		<property:Item rdf:resource="&wiki;Eau"/>
		<property:Item rdf:resource="&wiki;Verre"/>
		<property:Item rdf:resource="&wiki;Bassine"/>
		<property:Item rdf:resource="&wiki;Colorant"/>
		<property:Item rdf:resource="&wiki;Mouchoir"/>
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		<property:Main_Picture rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Air_le_bouclier_invisible_52144332_1169355599896038_7938173712853893120_n.jpg</property:Main_Picture>
		<property:Notes rdf:datatype="http://www.w3.org/2001/XMLSchema#string">[http://www.larousse.fr/dictionnaires/francais/air/1939 &lt;u&gt;Définition de l'air&lt;/u&gt;]</property:Notes>
		<property:Objectives rdf:datatype="http://www.w3.org/2001/XMLSchema#string">* Comprendre que l’air n’est pas « rien », mais un fluide.
* Mettre en évidence que la nature n’aime pas le vide.</property:Objectives>
		<property:Observations rdf:datatype="http://www.w3.org/2001/XMLSchema#string">L'eau ne remonte pas dans le gobelet et le mouchoir reste sec.( voir l'étape 5 résultat ci dessus)</property:Observations>
		<property:Related rdf:datatype="http://www.w3.org/2001/XMLSchema#string">* [http://www.wikidebrouillard.org/index.php?title=Air_:_sa_masse,_son_poids &lt;u&gt;Air, sa masse, son poids&lt;/u&gt;]
* [http://www.wikidebrouillard.org/index.php?title=Bougie_dans_le_bocal &lt;u&gt;Bougie dans le bocal&lt;/u&gt;]</property:Related>
		<property:Step_Content rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Remplis la bassine avec de l'eau (au moins l'équivalent de la hauteur du verre).</property:Step_Content>
		<property:Step_Content rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Mets, si tu en as, le colorant dans l'eau.</property:Step_Content>
		<property:Step_Content rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Place le mouchoir ou le morceau de papier au fond du gobelet.</property:Step_Content>
		<property:Step_Content rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Retourne le verre et l'immerger. Attention à bien garder le verre à la verticale pendant l'opération !</property:Step_Content>
		<property:Step_Title rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Remplir</property:Step_Title>
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		<property:Step_Title rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Retourner</property:Step_Title>
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