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Old 06-04-2015, 07:57 AM
wolfie wolfie is offline
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Join Date: Jul 2007
Posts: 6,041

Ale is a "top fermented" beer - the yeast works at the top of the vat, and prefers warm temperatures (what would be room temperature in a building without central heating).

Lager is "bottom fermented", and the yeast prefers cold temperatures. If it's too warm, things don't go too well - before mechanical refrigeration, Bavaria prohibited brewing in the heat of summer, so winter/spring beer was stored for summer consumption ("lager" is derived from the German verb "to store"), and there was a festival celebrating the first legal brew when the weather cooled down in the fall (Oktoberfest).

Pilsner is similar to lager (don't know the exact differences), and is named after the town of Pilsen in Chzecoslovakia.
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