Solids, liquids and gases. In a solid like this brick, the particles are regularly arranged touching their neighbours and move only by vibrating. This explains why solids have a fixed shape. In a ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Solids are divided into two main categories, crystalline solids and amorphous solids, based on ...

Matter is the name for anything that takes up space and that can weigh something. Everything around us is made of matter. Fran: We can compare or group different materials according to whether they ...