Final answer:
Antifreeze is primarily used in the cooling system of automobiles to prevent the freezing of the coolant, which could lead to engine damage. It contains compounds like ethylene or propylene glycol to lower the freezing point and raise the boiling point of the mixture. Methanol is also used in windshield washer fluids to prevent freezing.
Step-by-step explanation:
Antifreeze is a substance added to a water-based liquid to lower its freezing point, typically used in the cooling system of an automobile. This characteristic prevents the coolant from freezing, avoiding damage like cracking in engine blocks, radiators, and coolant lines. Ethylene glycol (Câ‚‚Hâ‚„(OH)â‚‚) is the main component in many antifreeze formulations, known for its ability to lower the freezing point and raise the boiling point of the coolant mixture. In addition, another common alcohol used as antifreeze is propylene glycol, noted for its lower toxicity compared to ethylene glycol, and methanol, which is mainly used in windshield washer fluids.
Freezing point depression is a phenomenon utilized in cold climates, not only in automotive applications but also in various other ways, such as melting ice and snow on roads and sidewalks using salt. Water and antifreeze are miscible, forming homogeneous mixtures in all proportions, which is vital for maintaining efficiency in heat transfer within the cooling system of vehicles. Therefore, the appropriate option for the question regarding where antifreeze is used is option C. Cooling system.