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The van der Waals equation is an equation of state that can be derived from a special form of the potential between a pair of molecules (hard-sphere repulsion and R-6 van der Waals attraction).van der Waals equation equation of state In physical chemistry, the van der Waals force (or van der Waals interaction), named after Dutch scientist Johannes Diderik van der Waals, is the attractive or repulsive force between molecules (or between parts of the same molecule) other than those due to covalent bonds or to the electrostatic interaction of ions with one another or with neutral molecules.[1]physical chemistryDutchJohannes Diderik van der Waalsmoleculescovalent bondselectrostatic interactionions[1]

The term includes: 1.permanent dipole–permanent dipole forces 2.permanent dipole–induced dipole forces 3.instantaneous induced dipole-induced dipole (London dispersion forces) It is also sometimes used loosely as a synonym for the totality of intermolecular forces. Van der Waals forces are relatively weak compared to normal chemical bonds, but play a fundamental role in fields as diverse as supramolecular chemistry, structural biology, polymer science, nanotechnology, surface science, and condensed matter physics. supramolecular chemistrystructural biology polymer sciencenanotechnologysurface sciencecondensed matter physics

Van der Waals forces define the chemical character of many organic compounds. They also define the solubility of organic substances in polar and non-polar media. In low alcohols, the properties of the polar hydroxyl group dominate the weak intermolecular forces of van der Waals. In higher alcohols, the properties of the unpolar alkyl rest (R) dominate and define the solubility. Van der Waals forces grow with the length of the non polar part of the substance.organic compoundspolar and non-polar