What are dissolved substances?

Dissolved substances are things that melt into another liquid and can't be seen anymore.

Imagine you're making a glass of lemonade. You take sugar and drop it into water. At first, you see the sugar grains, but after a little while, they disappear, they've become part of the liquid. That's what happens with dissolved substances: they mix in so well that you can't tell them apart from the liquid anymore.

Think of water as a crowd at a party. When you add sugar, it's like adding more guests who all find a spot to stand, they blend right into the group. The water molecules and sugar molecules move around together, making the drink sweet without any visible pieces.

When you make tea or soup, you're dissolving things too! You drop in a teabag or throw in some vegetables, and after a little time, they give their flavor to the water, just like sugar gives its sweetness. The water becomes a new kind of liquid with all the good stuff mixed in.