"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 drinker´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)
