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Carry a Column of Water
You will need: Glass of water, drinking straw.
Air pressure is used in many ways for pumping and moving water. Here is a means of moving a column of water.
Place a drinking straw in a glass of water and suck at the straw. First, you remove the air, and air pressure then forces water up in the straw. When water has reached your mouth, place a finger on the top end of the straw as you remove it from your mouth.
Keeping your finger in position, raise the straw from the glass. Trapped inside the straw, and retained there by air pressure, will be a slender column of water.
Release your finger from the end of the straw, thus allowing air to reach the top of the column, and the water will run from the straw.
Make sure that the glass is in correct position to receive the falling column of water.
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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