In chemistry,
bond-dissociation energy (BDE) or
D0, is one measure of the
strength in a
chemical bond. It can be defined as the
standard enthalpy change when a bond is cleaved by
homolysis, with reactants and products of the homolysis reaction at 0 K (
absolute zero). For instance, the bond-dissociation energy for one of the C–H bonds in
ethane (C
2H
6) is defined by the process:
CH
3CH
2–H →
CH3CH2· + H·