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		<property:Description rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Les brochettes vous aimer ? gardez les , sa vous aidera !</property:Description>
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		<property:Disciplines_scientifiques rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Matter Sciences</property:Disciplines_scientifiques>
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		<property:Explanations rdf:datatype="http://www.w3.org/2001/XMLSchema#string">La [http://ancien.wikidebrouillard.org/index.php?title=Tension_superficielle tension superficielle] est une force s'exerçant sur un liquide qui l'incite à diminuer sa surface de contact avec l'air. Il s'agit d'une force de contact assimilable à une force de pression.

L'eau possède donc une [http://ancien.wikidebrouillard.org/index.php?title=Tension_superficielle tension superficielle].

Lorsque le bateau est déposé sans savon, la [http://ancien.wikidebrouillard.org/index.php?title=Tension_superficielle tension superficielle] de l'eau s'applique de manière équivalente sur tout les côtés de la pièce de papier, la résultante des forces engendrées est alors nulle et le système est en équilibre. Une molécule de savon possède un coté qui se lie à l'eau (hydrophile) et un coté qui se lie avec autre chose (graisse, terre, etc.. on dit hydrophobe). En se mélangeant à l'eau, les molécules de savon cassent la [http://ancien.wikidebrouillard.org/index.php?title=Tension_superficielle tension superficielle] de l'eau. La surface de l'eau se "déchire" en entrainant le bateau, un peu comme si le bateau était la partie mobile d'une fermeture éclair qui s'ouvre.

Il faut alors changer l'eau du réservoir pour pouvoir recommencer l'expérience, car la [http://ancien.wikidebrouillard.org/index.php?title=Tension_superficielle tension superficielle] de l'eau est devenue trop faible en raison de l'action du savon.</property:Explanations>
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Etaler une goutte de liquide vaisselle à l'arrière du bateau grâce au pic à brochette. Remplir la bassine d'eau. Poser le bateau sur l'eau bien à plat.</property:Step_Content>
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