Everything about Cohesion Chemistry totally explained
Cohesion (v. lat.
cohaerere "stick or stay together") or
cohesive attraction or
cohesive force is a
physical property of a subtsance, caused by the
intermolecular attraction between like-
molecules within a body or substance that acts to unite them.
Water, for example, is strongly cohesive due to strong
polarity induced by two
hydrogen bonds in a
tetrahedral configuration. This results in a relatively strong
Coulomb force between molecules.
Van der Waals gases such as
methane, however, have weak cohesion due only to
Van der Waals forces that operate by induced polarity in non-polar molecules.
Cohesion, along with
adhesion (attraction between unlike molecules), helps explain phenomena such as
surface tension and
Capillary action.
Industry applications
The
construction industry uses many materials that undergo a
phase transition during installation and use. These include, but are not limited to the following:
- caulking
- firestop mortar
- concrete
- plaster
- spray fireproofing
- paint
Often, these building materials are required not just to be cast and occupy space. They must also stick and maintain a certain thickness or space. Paint typically doesn't require as much cohesion as caulking, as paint is applied much more thinly. High quality firestop mortars require extreme cohesion with the adhesion because they're often used in large wall openings, where the mortar must not only adhere to adjacent materials but also hold itself up, forming a wall in the plastic state, which must hold long enough to cure and convert to the solid state. The thicker the application, the more cohesion is required.
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