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The Disappearing Act
Drop a sugar cube into a glass of water and stir. The sugar seems to disappear! But it did not really vanish. It dissolved. The sugar broke apart into tiny pieces so small you cannot see them, and those pieces spread evenly throughout the water.
If you taste the water, it is sweet! The sugar is still there, just dissolved. When something dissolves, it mixes completely with the liquid. The mixture of dissolved substance and liquid is called a solution.