2. Materials around us - Change of state

Matter

All the material around us, made up of small parts called molecules.

Solid

Matter that keeps its shape and does not flow, with particles packed tightly together that only vibrate slightly.

Liquid

Matter that fills the container it's poured into and takes its shape, with particles that move more than solids' but not far from each other.

Gas

Matter that can fill any container completely, with molecules that move around a lot and are far apart.

States of matter

The different conditions in which matter can be found, such as solid, liquid, or gas.

Changes of state

When matter changes from one state to another. This happens when particles gain energy (with heat) or lose energy (cooling).

Heating

Gives particles more energy, allowing them to move more and undergo a change of state.

Melt

A change of state from a solid to a liquid.

Evaporate

A change of state from a liquid to a gas.

Cooling

Takes energy away from particles, causing a change of state.

Freeze

A change of state from a liquid to a solid.

Condensation

A change of state from a gas to a liquid.

Molecular characteristics

Properties of matter based on how its small parts (molecules or particles) are packed and move.

Water cycle

Shows how water moves between the land, the sea, and the clouds.