You will need: Soda, test tube, tongs, candle.
Water is present in varying degrees in many apparently solid substances. Our own bodies consist of a very high percentage of water. Even such substances as ordinary washing soda (or sodium carbonate, to give it its correct chemical name) contain a large proportion of water. This can be verified by a simple experiment.
Take a spoonful of soda and drop it into the bottom of a test tube.
Hold the tube by the tongs and allow a candle
flame to play on the end of the test tube containing the soda. Within a short
time, the soda will become damp and you will see water vapor rise up inside the
test tube, and condense on the cooler sides of the tube. This water had
originally been part of the soda crystals.
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!