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Intranet

Cúpula d’aigua

Objectiu: Observar els efectes de la tensió superficial de l’aigua quan col·loquem gotes d’aigua a sobre d’una moneda

  • Materials de laboratori

    Vas de precipitats

    Pipeta

    Moneda

  • Reactius

    Aigua

    Colorant alimentari (opcional)

    Sabó de plats

  • Preguntes

    Quantes gotes has pogut posar? És el que esperaves?

    De què depèn el nombre de gotes?

    Quan afegiu gotes d'aigua amb detergent, heu observat alguna diferència? Per què?

Procediment

  • Aboqueu aigua al vas de precipitats.
  • Afegiu-hi un parell de gotes de colorant alimentari (opcional).
  • Agafeu una moneda i renteu-la bé per eliminar qualsevol brutícia (assequeu-la bé per obtenir millors resultats).
  • Col·loqueu la moneda sobre una taula i pregunteu-vos quantes gotes podríem posar a sobre sense vessar. A veure qui endevina o s’acosta més al número correcte.
  • A poc a poc, seguiu afegint les gotes d’aigua i observeu la increïble forma de cúpula que forma l’aigua.
  • Ara, afegiu unes gotes de detergent a l’aigua del vas de precipitats i barregeu i repetiu l’experiment.

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