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common mis-conception (archive)
[ Follow Ups ] [ 5-series (E28) Message Board ] [ Msg. Board FAQ ]
Posted by Devinder on October 08, 2001 at 17:55:13:

In Reply to: If he's in U.S. or Canada, he's OK. posted by RonW on October 07, 2001 at 19:49:22:

The thermodynamics of mixtures is a bit wierd. Pure ethylene glycol freezes at 8°F. Water freezes at 32°F. A 60/40 EG/water mixture freezes at something like -30° to -40°F. Certain glycol/water mixtures can even lower the freezing point to about -90°F. This is why the correct mixture is important for low temperatures.

It's more complicated on the high temperature side. Glycol has a higher boiling point than water (something like 230°F), but it's thermal conductivity is less than water. So, the mixture ratio is much less important.

Of course, there are also compatibility and corrosion issues.

Devinder


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