actually kinda simple. beer is brewed with yeast as an ingredient. while in the cask, the yeast breaks down proteins in the mixture to form ethyl alcohol. due to the amount of water in the mixture, which yeast cannot break down, you’re limited by the volume of water. with liquor, water is removed by distillation, leaving a concentrated alcohol.
in overly simple terms, they boil off the water in liquor, leaving just the alcohol.
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