Does it dissolve?
Stir sugar into tea. The sugar vanishes: you cannot see it. Where did it go?
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The idea
The sugar did not go away. It spread through the tea in tiny pieces.
A solid keeps its own shape, like sugar.
Dissolve — to spread through water in pieces too small to see.
Some solids dissolve in water. The water stays clear.
Sugar and salt dissolve. Sand does not. It sinks to the bottom.
Step 1 of 4
- Sugar above one cup. Sand above another.
- Sugar drops in, all together.
- Stirred, it spreads too small to see.
- Sand sinks and stays whole.