Air that comes from normal breakdown of food. The gases are passed out of the body through the rectum (flatus) or the mouth (burp).
A substance such as nitrogen, carbon dioxide or air, which is neither solid nor fluid at ordinary temperatures and can expand infinitely.
Gas which accumulates in the stomach or alimentary canal and causes pain.
Basic form of matter; a gas lacks definite shape, and its volume depends on temperature and pressure.
One of the basic forms or states of matter. Gas molecules are free and move swiftly in all directions. Therefore, a gas not only takes the shape of the containing vessel but expands and fills the vessel no matter what its volume. Among the common important gases are oxygen; nitrogen; hydrogen; helium; sewer gas, which contains carbon monoxide; carbon dioxide; the anesthetic gases; ammonia; and the poisonous war gases. Liquids and solids may release toxic fumes or gases when heated.