Cohesionor cohesive attraction or cohesive force is a physical property of a substance, caused by the intermolecular attraction between like-molecules within a body or substance that acts to unite them. Water, for example, is strongly cohesive as each molecule may make four hydrogen bonds to other water molecules in a tetrahedral configuration.

Cohesion, along with adhesion (attraction between unlike molecules), helps explain phenomena such as surface tension and capillary action.

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