The arrangement, movement and spacing of particles are different in solids, liquids and gases. Find out more with BBC Bitesize. For students between the ages of 11 and 14.

Some liquids have a higher density than solids. For example, wood is a solid but has a lower density than water, which is why wood generally floats on top of water.

Teeny-tiny particles For a better understanding of the difference between solids, liquids and gases, we need to look at what they're made of. Scientists discovered that all materials are made of teeny ...

Molecules in a gas are more widely dispersed, freely moving around without obstructing one another. In a liquid, however, they rub up against each other, and in a solid they are so packed together ...

The four fundamental states of matter are solid, liquid, gas and plasma, but there others, such as Bose-Einstein condensates and time crystals, that are man-made.