It is the angle formed by the axes that join the nuclei of different atoms. Bond angles define the geometry of molecules.

In a molecule, atoms are arranged according to specific geometric bounds that define and provide the substance with specific properties. The geometry of the molecule (that is the arrangement in the space of its bonds) is one of the elements that may affect and define its polarity or non-polarity.

In Ceramics, it affects, for example, the nature of solvents that, according to their geometry, can be classified as polar or non-polar. This classification influences the selection of substances (solutes) that can or cannot be dissolved by the solvent.

As a rule, a molecule is polar if the sum of the dipolar moments of all its bonds is different from zero.