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**michael247** · 08-18-2012, 05:45 AM

> at CS's encouragement I've put a K thermocouple in the freezer

I did that once. Checking it with a hand-held pyrometer. The thermocouple measurement was good to the accuracy I needed (within a few degrees) but the pyrometer measurement was way out.

> should that sort of mix (Alc + water Freeze a this temp?)

According to the above figure, an ethanol-water mixture freezes at -20 degrees C if the ethanol molality is about 9. At -25 degrees C if the ethanol molality is about 12.

Anyone know how to convert 40% alc/vol to molality?
Molality is mass of solute (ethanol) / mass of solvent (water).

08-18-2012, 05:45 AM	#6
michael247 Join Date Oct 2005 Posts 480 Senior Member	> at CS's encouragement I've put a K thermocouple in the freezer I did that once. Checking it with a hand-held pyrometer. The thermocouple measurement was good to the accuracy I needed (within a few degrees) but the pyrometer measurement was way out. > should that sort of mix (Alc + water Freeze a this temp?) According to the above figure, an ethanol-water mixture freezes at -20 degrees C if the ethanol molality is about 9. At -25 degrees C if the ethanol molality is about 12. Anyone know how to convert 40% alc/vol to molality? Molality is mass of solute (ethanol) / mass of solvent (water).
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