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A class of chemical substances that are members of the alcohol family are called glycols. Their distinctive feature is that they are made up of two hydroxyl (OH) groups that are joined to separate carbon atoms in the same molecule. The two most widely used glycols, ethylene glycol and propylene glycol, are found in many different sectors. 1. Ethylene Glycol: Often used as antifreeze in car cooling systems, ethylene glycol is a colorless, odorless, and sweet-tasting liquid. It effectively keeps the engine coolant from freezing in cold weather because of its high boiling point and low freezing point. Ethylene glycol, however, is poisonous to both people and animals, and consuming it can have detrimental effects on one's health.Owing to its toxicity, attempts are undertaken to create substitute, less hazardous antifreeze solutions. 2. Propylene Glycol: Less hazardous than ethylene glycol, propylene glycol is another widely used glycol with comparable qualities. It is frequently employed as a humectant, solvent, and preservative in the food and pharmaceutical industries. Because of its capacity to hold onto moisture, propylene glycol is also used in the manufacturing of a variety of personal care products, including skin creams and lotions. It is also present in some varieties of de-icing and antifreeze solutions, though its application for these uses is less frequent than that of ethylene glycol. 3. Applications: Glycols are used for much more than just antifreeze. In the pharmaceutical and cosmetic sectors, they serve as solvents, aiding in the dissolution and stabilization of active substances in a range of formulations. Glycols are also essential for the synthesis of plasticizers, polyester resins, and polyurethanes. They are used as a component of hydraulic fluids and in the production of aircraft de-icing fluids due to their capacity to absorb and hold onto water. To sum up, glycols are versatile substances that have a big industrial impact. Propylene glycol is a less hazardous substitute for ethylene glycol, which is most commonly used in antifreeze, and is also used in food, medicine, and personal hygiene products. Glycols have a wide range of applications due to their unique qualities, which highlights their importance in contemporary industrial processes.