Some substances dissolve when you mix them with water. When a substance dissolves, it looks like it disappears. But in fact it has just mixed with the water to make a transparent (see-through) liquid called a solution.
When you mix sugar with water, the sugar dissolves to make a transparent solution. Salt dissolves in water too.
Substances that dissolve in water are called soluble substances.
Substances that do not dissolve in water are called insoluble substances.
When you mix sand or flour with water, they do not dissolve.
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.