A snifter (also called brandy snifter, brandy glass, brandy bowl, cognac glass, or balloon) is a type of stemware, a short-stemmed glass whose vessel has a wide bottom and a relatively narrow top. It is mostly used to serve aged brown spirits such as bourbon, brandy, and whisky. The large surface area of the contained liquid helps evaporate it, the narrow top traps the aroma inside the glass, while the rounded bottom allows the glass to be cupped in the hand, thus warming the liquor. Most snifters will hold 180–240 ml (6–8 US fl oz), but are almost always filled to only a small part of their capacity. Most snifters are designed so that when placed sideways on a level surface, they will hold just the proper amount before spilling. A variant is called a pipe glass or pipe snifter, used for port and brandy.