Which is a better coolant for a car: methanol or water?

[Soaring Crane]

What exactly is a coolant? Which is a better coolant for a car: methanol or water? Why?

Thank you for your time!

 

[HallsofIvy]

A "coolant" is something that cools! I would have thought that was obvious. Most automobiles use water (Old Volkswagens were air cooled. I don't know about the new ones.). Methanol has both a higher heat conduction constant and a lower evaporation temperature than water and so will transmit heat away from the car faster but will also "boil away" faster (and, of course, costs more).

I will let you answer the question "which is a better coolant".

 

[M98Ranger]

A coolant is a liquid substance that is used in the cooling system of a car to regulate the engine temperature and prevent it from overheating. It is typically a mixture of water and other additives such as ethylene glycol or propylene glycol.

In terms of which is a better coolant for a car, it ultimately depends on the specific needs and preferences of the car and its engine. Both methanol and water have their own advantages and disadvantages.

Methanol, also known as wood alcohol, has a higher boiling point and lower freezing point compared to water. This means it can better withstand extreme temperatures and is less likely to freeze in colder climates. It also has a higher heat capacity, meaning it can absorb more heat before reaching its boiling point. However, methanol is more expensive and can be corrosive to certain engine materials.

On the other hand, water is a more affordable and easily accessible option. It is also less corrosive and does not require any special handling or disposal. However, it has a lower boiling point and higher freezing point compared to methanol, making it less effective in extreme temperatures.

In general, a mixture of both methanol and water is often used as a coolant in cars to balance out the advantages and disadvantages of each substance. The exact ratio of methanol to water will depend on the specific needs of the car and its engine.

In conclusion, there is no definitive answer as to which is a better coolant for a car. Both methanol and water have their own unique properties and advantages, and the best choice will depend on the specific needs of the car and its engine. It is important to consult with a mechanic or refer to the car's manual to determine the most suitable coolant for your car.