The state of matter is a deceptively simple concept. It turns out that any material, no matter what it is made of, can exist in one of three forms: solid, liquid or gas. These are categories of ...

The interactive activity on this page is designed to visualise the states of matter and what happens when substances change state. You can use it to help your revision. There are three main states ...

For a hundred years, physicists have grappled with a seemingly simple question: How can the transition of substances into different states be easily predicted? Understanding the three states of ...