"Beer glassware comprises the drinking vessels made of glass designed or commonly used for drinking beer. Different styles of glassware exist for a number of reasons: ...
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they may reflect national traditions; legislation regarding serving measures; practicalities of stacking, washing and avoiding breakage; promotion of commercial breweries; folk art, novelty items or use in drinking games; or complementing different styles of beer for a variety of reasons, including enhancing aromatic volatiles, showcasing the appearance, and having an effect on the beer head. Several kinds of beer glassware have a stem which serves to prevent the body heat of the drinkerĀ“s hand from warming the beer. Some countries require fill lines on glasses to ensure customers receive the full volume of beer ordered." - (en.wikipedia.org 06.10.2019)