Molecular Model of Solids
The molecular model of solids is shown in the figure below:
- Each solid is made up of very tiny particles called molecules that are in a rigid arrangement.
- The inter-molecular space is very small incase of solids.
- The molecules in a solid can only vibrate to and fro about their mean positions. They do not leave their positions.
- The molecules in a solid are closely packed due to strong inter-molecular force of attraction between them.
- Solids have definite shape and volume.
Molecular Model of Liquids
The molecular model of liquids is shown in the figure below:
- Each liquid is made up of very tiny particles called molecules that are not in a rigid arrangement.
- The inter-molecular spaces in liquids are more than that in solids.
- The molecules in a liquid are less closely packed and their positions are not fixed as they are free to move within the boundary of the vessel in which the liquid is kept.
- Although the inter-molecular force of attraction is weak as compared to solids but it is sufficient to keep them within the boundary of the vessel.
- Liquids have definite volume but no definite shape.
Molecular Model of Gases
The molecular model of gases is shown in the figure below:
- Gases are made up of very tiny particles called molecules that are not in a rigid arrangement.
- In gases the inter-molecular space is maximum and the force of attraction is least as compared to solids and liquids.
- The position of these molecules are not fixed. The molecules can move randomly anywhere due to weak inter-molecular forces.
- Gases have neither definite shape nor definite volume.