Can we use alcohols as antifridging agent?

Asked by rajesh | 12th Jun, 2013, 06:21: PM

Expert Answer:

An antifreeze is a chemical additive which lowers the freezing point of a water-based liquid. An antifreeze mixture is used to achieve freezing-point depression for cold environments and also achieves boiling-point elevation ("anti-boil") to allow higher coolant temperature. Freezing and boiling points are colligative properties of a solution, which depend on the concentration of the dissolved substance. Methanol has freezing point at around -98oC so it can make the liquid substance not to freeze easily after adding methanol into it.
 
Ethylene glycol has desirable thermal properties, including a high boiling point, very low freezing point, stability over a wide range of temperatures, and high specific heat and thermal conductivity and has a very low volatility compared to methanol and to water. Hence it is used an antifreezing agent.

Answered by  | 13th Jun, 2013, 10:08: AM

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