Question

Why is a mixture of water and alcohol used instead of water in radiators of vehicles in cold countries? Give two reasons.

Answer 1

In radiators a mixture of water and alcohol is used as:

1. In the cold countries, the temperature is below $0°C$, that is below the freezing point of water.
2. Alcohol is added to water as its freezing point is below $0°C$.
3. These two are miscible in all proportions.
4. By mixing them together the freezing point becomes much lower than that of water.