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.
If refrigerated within a kegerator that uses CO2, a keg will generally last at least 6-8 weeks before it starts to lose its fresh taste. If you store it at the appropriate temperatures, pasteurized beer will last you at least three months, sometimes as long as six months. Unpasteurized beer will only last two months.uarter Barrel â Also known as a pony keg, this âhalf-sizeâ keg has approximately half the capacity of a standard, half barrel keg. This keg measures 13â inches tall, 16â inches in diameter, and weighs about 87 pound when full. It holds 7.75 gallons, the equivalent of eighty-two 12oz cans of beer or sixty-two pints.