A bond length describes the separation of the atomic nuclei of two bonded chemical atoms. Distinguish an equilibrium geometry from an instantaneous or experimentally averaged separation. Methods of determining molecular geometry can use different averaging conventions, so reported bond lengths need their measurement context. See the IUPAC Gold Book: bond length. Changing a bond length is one possible reaction coordinate.
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Bond length is the average distance between the nuclei of two bonded atoms in a molecule. It is a fundamental property of chemical bonds, indicating the spatial separation at which the two atoms are most stable when they are joined by a covalent bond. Bond lengths can vary depending on the types of atoms involved, the nature of the bond (single, double, triple), and the molecular environment.