Illustrated Glossary of Organic Chemistry

Integration: In NMR spectroscopy, the process of measuring the area of an NMR signal. The area corresponds to the amount of energy absorbed or released by all nuclei of a given chemical shift during the nuclear spin flip process. The resulting integrals are used to determine the ratio of hydrogens (or rarely carbons) that correspond to the signal.

The ¹H-NMR spectrum of CH₃OCH₂Cl shows two signals:
5.46 ppm (singlet; integral = 1.0) corresponds to the CH₂ group
3.51 ppm (singlet; integral = 1.5) corresponds to the CH₃ group