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Van der Waals forces are weak intermolecular forces that are dependent on the distance between atoms or molecules. These forces arise from the interactions. Van der Waals interaction (also known as London dispersion energies). Van der Waals (VDW) interactions are probably the most basic type of interaction.Molecular solids become compre- hensible as soon as we recognize the contributions of the weak forces known as van der Waals attraction and hydrogen bonding.