Expansion Race
You will need: Three small bottles of
similar size, three glass tubes,
water, turpentine, rubbing alcohol, bowl.
Obtain three small bottles of the same size, each with a
well-fitting cork. Drill holes in the corks to receive lengths of glass tubing.
Fill the bottles with different liquids, e.g., water,
turpentine, rubbing alcohol, etc. Label each bottle and keep them away from
flames.
Pour
hot (but not boiling) water into a bowl and stand the three jars in the water.
As the liquids become heated they will expand- but not to an equal degree.
The
only escape for the expanding liquids is via the glass tubes. You will soon see
which liquid wins this race of expansion. The alcohol will reach a higher point
in its tube than the turpentine, thus indicating that it has a higher rate of
expansion at the same temperature. The water will be found the least expansive
of the three fluids.
Children learn best through doing
Before children can
understand a thing, they need experience: seeing, touching, hearing, tasting,
smelling; choosing, arranging, putting things together, taking things apart.
Experimenting with real things.
Old-time school teaching
used only words and the teachers thought children knew something if they could
repeat it. Now we know better. To reach practical understanding we do not need
to use many words with young children.
Children are
clever. They learn a lot, without being taught. The greatest skill - to be able
to talk, to communicate is learnt outside school. In the classroom it's the
children who need to talk the most. Unfortunately it is the teacher who does
most of the talking!
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