Acetone is an important organic solvent widely used in industry, medicine and other fields. It is a colorless and transparent liquid with a characteristic smell. In terms of its saturation or unsaturation, the answer is that acetone is an unsaturated compound.

To be more specific, acetone is a three-membered cyclic ketone, which is composed of two methyl groups and one carbonyl group. It has a double bond between the carbonyl group and the methyl group on the same side. This double bond is not saturated, which determines that acetone is an unsaturated compound.

In addition, acetone also has a π bond between the carbonyl group and the opposite side of the methyl group, but this bond is not saturated. Therefore, acetone still belongs to an unsaturated compound.

The unsaturated bond in acetone can react with various compounds to produce polymers, coatings and other products. In addition, acetone can also react with water to produce formaldehyde, which is widely used in the production of resin and other industries.

In general, acetone is an important organic compound, which has a wide range of applications in various fields. As an unsaturated compound, it has good chemical reactivity and can react with many compounds to produce new materials with different properties. Therefore, we should continue to study its physical and chemical properties, and find more applications in various fields.