1. Solids, Liquids and gases - Arrangement of particles

State of matter

The form that matter can take, like solid, liquid, or gas.

particle

Very, very small building blocks that all matter is made of.

solid

A state of matter where particles are tightly packed and keep their own shape.

liquid

A state of matter where particles are close together but can move around, taking the shape of their container.

gas

A state of matter where particles are far apart and move freely, filling any container.

vacuum

An empty space where there are no particles.

compressed

To be squeezed into a smaller shape.

disperse

To spread out over an area or space.

melting

The process when a solid changes into a liquid.

evaporation

The process where a liquid changes into a gas.

condensation

The process when a gas changes back into a liquid.

boiling

Heating a liquid until it turns into a gas.

freezing

Changing a liquid into a solid by cooling it.