Definition and Chemical Properties of MEG Monoethylene glycol (MEG) is a colorless, odorless, and hygroscopic liquid that belongs to the family of glycols. Its chemical formula is C2H6O2, and it has a molecular weight of 62.07 g/mol. MEG is characterized by its low volatility, high boiling point (197.6 °C), and excellent solubility in water, making it an ideal solvent for various applications. As a diol, MEG contains two …