Everything is made up of particals:
Chairs, clothes and you!
Particals are so small that you can only see them under a microscope.
They can exisit in three different states:
The solid,
liquid
or gas state.
Think about ice - ice is water in the solid state.
In the solid state, particles only vibrate and are close together. This is what makes ice or any other material such as concrete or wood hard.
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