abbreviation of cornellius keg. A stainless steel tank, with gas in and liquid out posts that mate with quick disconnects for simple attachment and removal of hoses. 5 gallon capacity is the most common size used by homebrewers. Corny-kegs were most recognized in the soda industry for many years.
Cornelius kegs come in various sizes, but many home brewers use the "five gallon" (nominal) size. Including the headspace, how much volume is available inside of the standard five gallon Cornelius ...