-> That might be a part of the explanations but the beer was in 33 cl cans and 
-> the liquor was in an 8 cl jar. 
-> Another probaly is that liquor has a lower freezing-point than beer. It diif 
-> 34% alchohol. 95% ethyl alcohol have a freezing point at -117.3C (-179.14F). 
-> Beer freeze in the freezer where it's only -18C (-0.4F). 
  
Did your beer freeze? It seems unlikely, after only 30 minutes in a 
freezer. If the beer and liquor both remained liquid, then freezing 
points are irrelevant. 
  
The thermal conductivity of glass is far lower than that of aluminum, 
or steel - whatever the cans were made of. Also, the glass wall of a 
bottle is far thicker than the metal wall of a can. 
  
I guess you could try putting some liquor into a beer can, and also 
into one of the regular 80 ml jars, and see which sample cools faster. I 
am sure the one in the can will do so. In this experiment, only the 
container is different. 
  
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