Solids have to be kept in closed containers.

The gas particles can fill any space
.

Both liquids and gases are kept in closed containers.

Solid can't be changed easily because its shape is fixed.

The kinetic theory helps to understand the states of matter.

The particles in a boiling kettle move faster and faster.

Gas is one of the substances that can be found in three states.

The particles of food in the freezer get closer .

In solid, the particles change places easily .

"slight damage" is "almost total damage".

"serious damage" means "very bad damage".

"slight damage" is "little damage".

( To work with tools is to work with bare hands.

Irresponsibility is to take charge of something.