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Creating
Water in the Desert
Creating
Water in the Desert
    
Overview: This
is such a neat little experiment, it's fun and informative for
all ages. Based on the process of condensation, it appears to create water
from nothing (which is, of course, not the case).
Teacher Preparation: Aquarium, sand, clear plastic, small container
like a jar lid, plant, water.
Procedure Ideas:
- Put 5-10 cm of
sand in aquarium.
- Hollow out a 10-15
cm depression in the sand.
- Place jar lid in
the center of the hole, and plant material (small whole plants or broken
up larger ones) around the container on the sand.
- Lay 20x20 cm clear
plastic over the hole, and hold in place with sand or pebbles around
the edges.
- Put just enough
sand or a pebble in the very center of the plastic to make it sag slightly.
Too much weight will pull the plastic loose around the edges.
- To speed up the
process, place a light bulb over the aquarium to warm the sand and plastic,
as the sun might.
- Water from the
plants will form on the underside of the plastic by evaporation (from
the plants and residual moisture in the sand) and condensation. If the
plastic sags enough, the moisture will run to the center of the plastic
and drip into the container in the bottom of the hole.
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