Have you ever wondered what happens to salt when you stir it into a glass of water? It seems to vanish — but is it really gone? In this simple experiment we explore one of the most important ideas in science: the physical change.
A physical change is a change in which no new substance is formed. The material may change its shape, size, or state, but it is still the same substance underneath. Best of all, most physical changes can be reversed.
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