Interactions between particles

The interaction between particles is due to the interaction of the molecules in one particle with those in the other particles (Fig. 1.5). Although an interaction between two individual molecules becomes negligible after a small distance (say about 5 Angstrom), the interaction between two particles containing many molecules is significant upto much larger distances. There are many different types of interactions between molecules.

              Figure 1.5. Particles are made up of many molecules which interact with each other

Some of the significant types of interactions between molecules are-

1. Van Der Waals force
2. Electrostatic double layer force
3. Acid-Base interactions (For this interaction, conjugate polarity is required amongst neighboring molecules)