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.
15.5 gallons - in ths U.S. A keg is also known as a half-barrel. A barrel is the volume measurement of beer used in the brewing industry. Most breweries measure their capacity in barrels, which is 31 gallons. There are 128 ounces in a gallon. There are 1984 ounces of beer in a keg. 15.5 gallons - in ths U.S. A keg is also known as a half-barrel. A barrel is the volume measurement of beer used in the brewing industry. Most breweries measure their capacity in barrels, which is 31 gallons. There are 128 ounces in a gallon.