Degree of Unsaturation Definition:

The absence of two hydrogen atoms associated with a ring or a p bond.

Degree of Unsaturation Explained:

Calculating the degrees of unsaturation is crucial in determining the molecular structure, by knowing the number of bonds and or cyclic rings. One degree of unsaturation is equal to 1 ring or 1 double bond. Two degrees of unsaturation is equivalent to 2 double bonds, 1 ring, and 1 double bond, 2 rings, or 1 triple bond.