States of Matter describes how different materials can be either solids, liquids or gases. Everything is made up from tiny particles which we call atoms and molecules and it is the way that these are arranged that determines whether a material is a solid a liquid or a gas.
Solids
In a gas, the particles are widely spread and are not arranged in any regular pattern. They are free to move around in any direction and are not bonded to any neighbouring particles. Gases can be compressed, have no fixed shape, variable volumes and low weight. Gas particles have the most energy of all states of matter.
Liquids
In a liquid, the particles are less tightly packed, they are arranged in an irregular pattern and are free to slide over one another. They have fairly weak bonds with nearby particles. Liquids are not easily compresses, have no fixed shape, have fixed volumes and can also be heavy or not.
Gases
In a gas, the particles are widely spread and are not arranged in any particular pattern. They are free to move around in any direction and are not bonded to any nearby particles. Gases can be compressed, have no fixed shape, their volumes vary and they have low weight.