"Let's play with water"'s workshops · Mar 31, 11:05 AM

After Laura, we started our workshop where we played with water to learn different and important things about this resource.

Activity I
Plants circulation system
Water circulation in plants is important to nutrients and other substances transportation. It works different in plants and in animals.
atelier 8
In glass containers we put water and food colorant. Then we add celery and leave it for 30 minutes. After this we observe how the celery absorb the liquid and stained the stem.
Beside water circulation we made a reflexion about how plants canals absorb all the contaminants that we find in water and rivers.
atelier 8

atelier 8

Activity II
We gave the kids seeds of “jaragua” (a kind of grass). They observed them with the magnifying glass and then add water. We asked them to describe what they were observing: seeds started to move rapidly due to the water contact, they said seeds were dancing. We explain what was happening and remind how important water is to star life. They were witnesses of the osmosis process.
atelier 8
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
Surface tension
Surface tension is an attractive property of the surface of a liquid. It is what causes the surface portion of liquid to be attracted to another surface, such as that of another portion of liquid. Is caused by the attraction between the liquid’s molecules by various intermolecular forces. In the bulk of the liquid, each molecule is pulled equally in all directions by neighboring liquid molecules, resulting in a net force of zero. The effects of surface tension can be seen with ordinary water: Beading of rainwater on the surface of a waxed automobile. Water adheres weakly to wax and strongly to itself, so water clusters into drops. Surface tension gives them their near-spherical shape.

We put water in a container and gave the kids a needle, they kept it floating until we add liquid soap, at this time surface tension broke and the needle went to the bottom.Kids understood and saw the phenomena and also learn how contamination broke environmental equilibrium.

Foundation Randy Explorer
 


— Randy Explorer

---

Comentarios

Commenting is closed for this article.