Page 207 - Primary Five Science

Characteristics of each state of matter

Solids

1. Solids have a definite shapes

2. Some solids can change into liquids by heating

3. Solids have a fixed state at room temperature

4. Some solids expand when heated

5. Have molecules closely held together

6. The force of attraction between molecules is great

(cohesion)

Liquids

1. The cohesion force is weak and that is why molecules move

about freely inside the liquids.

2. Have no definite shapes i.e. take the shape of the container

3. Some liquids change into gases by heating

4. Some liquids change into solids by freezing

5. Liquids expand when heated

Gases

1. Gases have neither definite shapes nor volumes

2. Have molecules far apart

3. Some gases cannot be seen but can be felt

4. Gases expand the most when heated

5. Gases cannot be touched

Molecules held together

Molecules are small particles that make up matter. Molecules

are made up of atoms

An atom is the smallest particle of a chemical element that can

exist.