let's play with water

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workshop from the foundation Randy

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  • The project of 2008-2009

    Together for Water

    Is part of the decade

    2005-2015

    Voted by the UNO

    Water: Source of Life

  • Activity I

    The system of circulation in plants

    We put celery in water with colorant.

  • After 30 minuts we can obser how the celery absorbed the liquid.

  • Activity II La osmosis

    We put some seeds in water.

  • The seeds started to move rapidly in contact with water, as if they were dancing

  • Osmosis is the diffusion of a solvent (frequently water) through a semi-permeable membrane, from a

    solution of low solute concentration (high water potential) to a solution with high solute concentration

    (low water potential), up a solute concentration gradient.

    It is a physical process in which a solvent moves, without input of energy, across a semi-permeable membrane (permeable to the solvent, but not the

    solute) separating two solutions of different concentrations.

    Osmosis releases energy, and can be made to do work, as when a growing tree root splits a stone .

  • Activity III

    Superficial tension of water.

    The kids have too make a needle float on water.

  • That was easy to until we add liquid soap, at this time surface tension broke and the needle went to the bottom.

  • See you soon !