A solid has a

volume and a

shape

The particles are:

and held in

positions by

forces.

They

move around, but they can

Liquids have a

volume and

a fixed shape.

The particles are:

together, held together by

forces and

move around.

Gases can

to fill a container and can take the

of a container.

The particles are:

,held by

and

move around in

directions.

The melting and

points of a substance are at the

temperature.

The temperature of a substance

change when melting or

Substances

when they are heated.

The particles move around

and take up

space.

As a substance expands, its density

Substances

when they cool down.

The particles move around

and have

energy.

As a substance contracts, its density

As you go

into the sea, the

increases because there is

water pressing down above you.

As you go

up a mountain, the pressure

because there is less air

down above you.

The drag

as the

increases, so cars use up

fuel if they are travelling fast.