The three states of matter

Solids, Liquids and Gases

In this chapter you will learn:

  1. What are solids?

  2. What are liquids?

  3. What are gases?

The three states of matter are solid, liquid and gas.


Solid does not flow easily.

In solids, particles are attached very close together.

Solids have definite shape.

Solids have high density.

Solids can not be compressed easily.


Liquids have a definite volume.

A liquid has no definite shape and takes the shape of its container.

Liquids are often difficult to compress.


Gases can be compressed easily.

Gases have no definite volume.

Gases take the same shape of their containers.

Gases have lower density than solids and liquids.

The particles of gas move very fast and collide with each other.

The amount of energy needed to change state from solid to liquid and from liquid to gas depends on the strength of the forces between the particles of the substance. Every substance has its own melting point and boiling point.

The stronger the forces between particles, the higher it's melting and boiling point.