- noun a substance that is not a liquid or a solid, which will completely fill the container it occupies, and which becomes liquid when it is cooled
- noun a substance found underground, or produced from coal, and used to cook or heat
- A state of matter characterized by very low density, comparatively large changes in volume as pressure and temperature vary, and the tendency to assume the shape of its container. Gases move freely past one another, and diffuse readily into other gases. A gas may be a chemical element, such as argon or oxygen, or a compound, such as carbon dioxide. The other physical states in which matter is known to exist are solid (1), liquid, plasma, and Bose-Einstein condensates.
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