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Dave - Yes. Beers got lots of things dissolved in it alcohol, sugar etc. Anything dissolved in water will reduce its freezing point. So beer does freeze below zero, maybe at -1 or -2.Chris - And CO2, I suppose, if its fizzy that will have an effect too?Dave - That will also have an effect, definitely.Chris - So if you were to take some beer and put that in the freezer, could you make it much stronger? Is this a way that you could illicitly do a bit of distillation, because you would freeze the water into ice first, and then some slightly more alcoholic liquid will be left?Dave - Thats right. When you freeze water it cant take in all these solutes, the dissolved things, into its structure, because ice remains really quite pure. Whats left gets stronger and stronger. I dont know if youve ever drunk frozen squash or frozen fruit juice? The stuff you drink first, which is the liquid which melts first, is incredibly strong and very sugary, and then slowly as it melts it gets weaker and weaker, until whats left is basically pure water.
obvious. beer has lots of things dissolved in it so it has to have a lower freezing point and a higher boiling point
One of the things in beer is alcohol which has a low boiling point. You are right about the freezing point (unless it's a very weird beer) but the boiling point may be higher or lower than that of water.