How is polarity measured?

The dipole moment quantifies how polar a molecule is. The dipole moment increases with greater differences in electronegativity between atoms and with longer distances separating these charges. To calculate the dipole moment of a molecule, one must multiply the distance between the charges by the magnitude of the charge. This product is expressed in debye units, where 1 debye equals 3.34 x 10^-30 coulomb-meters