Carboy
A carboy, also known as a demijohn, is a rigid container with a typical capacity of. Carboys are primarily used for transporting liquids, often drinking water or chemicals.
They are also used for in-home fermentation of beverages, often beer or wine.
History and etymology
The word carboy is from the Persian qarābah, from Middle Persian Karāvah. Arabic also borrowed it as qarrāba, meaning "big jug". The Spanish-language term is garrafa. English carafe is an etymological doublet via Italian and French.Demijohn originally referred to any glass vessel with a large body and small neck, enclosed in wickerwork. The word presumably comes from the French dame-jeanne, literally "Lady Jane", as a popular appellation; this word is first attested in France in the 17th century. In Italian it is called damigiana, most probably derived from French. In some Spanish-speaking countries such as Argentina, it is also referred to as damajuana.
Size
Carboy volumes range from. The term carboy itself usually indicates a size, unless otherwise noted. A carboy is sometimes called a jug. A carboy is normally called a demijohn.In Britain, "demijohn" refers to a glass brewing vessel.
Brewing
In brewing, a carboy or demijohn is a glass or plastic vessel used in fermenting beverages such as wine, mead, cider, perry, and beer. Usually it is fitted with a rubber stopper and a fermentation lock to prevent bacteria and oxygen from entering during the fermentation process.During the homebrewing process, a primary carboy is used for fermentation. Once primary fermentation is complete, the beer is either transferred to a secondary carboy for conditioning or it can be transferred directly to bottles for conditioning.