A unit of electric dipole moment in the electrostatic system, used to express dipole moments of molecules. It is the dipole moment produced by two charges of opposite sign, each of 1 statcoulomb and placed 10−18 cm apart, and has the value 3.335 64×10−30 coulomb metre. It is named after the Dutch chemist and physicist Peter J. W. Debye (1884–1966).