In simplest terms, matter is stuff. That means that water, table salt, mud, orange peels, air, smoke and tennis rackets are all matter. More scientifically, matter is defined as anything that has mass and volume. Unfortunately that definition brings us two new ideas to define: having mass and having volume.

In simplest terms then, matter is anything that you can feel when it hits you and that takes up space.

On to reactions and interactions of matter

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