This article is about the state of matter. For liquified petroleum gas used as an automotive fuel, see autogas. For gasoline ("gas"), see gasoline. For the uses of gases, and other meanings, see Gas (disambiguation).
Drifting smoke particles indicate the movement of the surrounding gas.
Gas is one of the four fundamental states of matter. The others are solid, liquid, and plasma.[1] A pure gas may be made up of individual atoms (e.g. a noble gas like neon), elemental molecules made from one type of atom (e.g. oxygen), or compound molecules made from a variety of atoms (e.g. carbon dioxide). A gas mixture, such as air, contains a variety of pure gases. What distinguishes gases from liquids and solids is the vast separation of the individual gas particles. This separation usually makes a colorless gas invisible to the human observer.
The gaseous state of matter occurs between the liquid and plasma states,[2] the latter of which provides the upper-temperature boundary for gases. Bounding the lower end of the temperature scale lie degenerative quantum gases[3] which are gaining increasing attention.[4]
High-density atomic gases super-cooled to very low temperatures are classified by their statistical behavior as either Bose gases or Fermi gases. For a comprehensive listing of these exotic states of matter, see list of states of matter.
^"Gas". Merriam-Webster. 7 August 2023.
^This early 20th century discussion infers what is regarded as the plasma state. See page 137 of American Chemical Society, Faraday Society, Chemical Society (Great Britain) The Journal of Physical Chemistry, Volume 11 Cornell (1907).
^Zelevinsky, Tanya (2009-11-09). "—just right for forming a Bose-Einstein condensate". Physics. 2 (20): 94. arXiv:0910.0634. doi:10.1103/PhysRevLett.103.200401. PMID 20365964. S2CID 14321276.
^"Quantum Gas Microscope Offers Glimpse Of Quirky Ultracold Atoms". ScienceDaily. Retrieved 2023-02-06.
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