A chemical compound, CH₃COCH₃; the first member of the homologous series of aliphatic ketones. It is a colorless liquid with an ethereal odor. Its physical properties include boiling point 56.2°C (133°F), melting point −94.8°C (−138.6°F), and specific gravity 0.791. Acetone is an extremely important, low-cost raw material that is used for production of other chemicals.