The air reaches the tiny air sacs (alveoli) in the inner part of the lungs with any dust particles that avoided the defenses in the nose and airways. The air sacs are very important because through them, the body receives oxygen and releases carbon dioxide.
1 A full size keg holds about 15.5 gallons (165 12-oz cups) and is sometimes referred to as a 1/2 keg. 2  The full-size kegs typically start at about $100 for American draft beers. 3  Specialty beers, lagers and ales can cost from $125-$250.
How many glasses of beer are there in a keg? The standard U.S. keg size is a half barrel and has a capacity of 15.5 gallons or 1984 ounces, which is the equivalent of 165 12-ounce glasses of beer. The standard keg measures 23 3/8 inches high by 16 1/8 inches wide and weighs 161 pounds when full.