Editing Beer tap (section)

===Pressure-dispense bar tap===
Beer supplied in [[keg]]s is served with the aid of external pressure from a cylinder of [[carbon dioxide]] (or occasionally [[nitrogen]]) which forces the beer out of the keg and up a narrow tube to the bar. At the end of this tube is a valve built into a fixture (usually somewhat decorative) on the bar. This is the beer tap and opening it with a small lever causes beer, pushed by the gas from the cylinder, to flow into the glass. Some view this system as disadvantageous as it produces a frothy head which must be left to subside before more beer can be added to the glass. Some manufacturers have tried to address this problem by producing a device which allows the beer to be poured from the bottom up.{{citation needed|date=September 2020}} Some people, such as Germans and the Dutch prefer a rather large amount of head on their beers.{{citation needed|date=March 2019}}