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Intranet

Aigua que no mulla

Objectiu: Observar l’efecte de la tensió superficial de l’aigua

  • Materials de laboratori

    Envàs de plàstic

  • Reactius

    Aigua

    Potència de talc

    Sabó de plats

  • Preguntes

    Què es pot observar en mullar els dits? I quan hi ha sabó?

    Amb quina propietat estem treballant?

Procediment

  • Ompliu el recipient de plàstic amb aigua fins que estigui una mica més de la meitat.
  • Afegiu pols de talc a tota la superfície de l’aigua.
  • Apropeu suaument els dits d’una mà a la superfície i submergiu-los suaument a l’aigua. Observa què passa.
  • Ara prova de mullar-te els dits amb sabó líquid (líquid per rentar plats) i torna a submergir-los a l’aigua. Observa què passa.

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