gas


gas
1. A thin fluid, like air, capable of indefinite expansion but convertible by compression and cold into a liquid and, eventually, a solid. 2. In clinical practice, a liquid entirely in its vapor phase at one atmosphere of pressure because ambient temperature is above its boiling point. [coined by J.B. van Helmont, Flemish chemist and physician, 1577–1644]
- alveolar g. (symbol subscript A) the g. in the pulmonary alveoli, where O2-CO2 exchange with pulmonary capillary blood occurs. SYN: alveolar air.
- anesthetic g. inhalation anesthetic.
- blood gases a clinical expression for the determination of the partial pressures of oxygen and carbon dioxide in blood.
- expired g. 1. any g. that has been expired from the lungs; 2. often used synonymously with mixed expired g..
- ideal alveolar g. the uniform composition of g. that would exist in all alveoli for a given total respiratory exchange if all alveoli had identical ventilation-perfusion ratios and achieved perfect equilibrium with the blood leaving the pulmonary capillaries.
- inert gases SYN: noble gases.
- inspired g. (I) (symbol subscript I) 1. any g. that is being inhaled; 2. specifically, that g. after it has been humidified at body temperature.
- laughing g. a historical term for nitrous oxide. [so called because its inhalation sometimes excites a hilarious delirium preceding insensibility]
- marsh g. SYN: methane.
- mixed expired g. one or more complete breaths of expired g. coming thoroughly mixed from the dead space and the alveoli.
- mustard g. (HD) a poisonous vesicating g. introduced in World War I; it is the progenitor of the so-called nitrogen mustards; used in chemical warfare; a known carcinogen. SYN: di(2-chloroethyl)sulfide, mustard (2), sulfur mustard.
- noble gases elements in the zero group in the periodic series : helium, neon, argon, krypton, xenon, and radon. SYN: inert gases.
- sewer g. g., probably mostly methane, resulting from decomposition of organic matter in sewers; potentially explosive and toxic.
- sneezing g. SYN: sternutator.
- suffocating g. a g., such as chlorine or phosgene, that causes intense irritation of the bronchial tubes and lungs, resulting in pulmonary edema.
- tear g. a g., such as acetone, benzene bromide, and xylol, that causes irritation of the conjunctiva and profuse lacrimation. SEE ALSO: lacrimator.
- vesicating g. a g., such as mustard g., which upon contact with the skin causes vesication and sloughing; inhalation may result in bronchopneumonia.
- vomiting g. a g., such as chloropicrin, that can cause vomiting and gastrointestinal disorders such as colic and diarrhea.
- water g. an illuminating and fuel g. produced by passing steam over red-hot coal; consists chiefly of hydrogen, hydrocarbons, and carbon monoxide.
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galactorrhea-amenorrhea syndrome; gastric acid secretion; gastrin; gastroenterology; general adaptation syndrome; General Anxiety Scale; generalized arteriosclerosis; global anxiety score; global assessment scale; goal attainment scale; group A Streptococcus; growth arrest-specific [gene]

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GAS abbr general adaptation syndrome

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(gas) any elastic aeriform fluid in which the molecules are separated from one another and so have free paths.

Medical dictionary. 2011.

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  • Gas — (et) …   Kölsch Dialekt Lexikon

  • Gas — [ga:s], das; es, e: 1. a) unsichtbarer Stoff in der Form wie Luft: giftiges, brennbares, explosives Gas; einen Ballon mit Gas füllen; zu Gas werden; in der Flüssigkeit sind mehrere Gase aufgelöst. b) brennbares, zum Kochen und Heizen verwendetes… …   Universal-Lexikon

  • gas — s.m.inv. 1a. FO ogni sostanza che, a temperatura e pressione normale, è allo stato aeriforme, in contrapposizione ai solidi e ai liquidi, e non presenta forma e volume propri 1b. TS fis., chim. sostanza aeriforme che si trova al di sopra della… …   Dizionario italiano

  • Gas — (g[a^]s), n.; pl. {Gases} (g[a^]s [e^]z). [Invented by the chemist Van Helmont of Brussels, who died in 1644.] 1. An a[ e]riform fluid; a term used at first by chemists as synonymous with air, but since restricted to fluids supposed to be… …   The Collaborative International Dictionary of English

  • gas — (Palabra inventada por el científico flamenco J. B. van Helmont en el siglo XVII, sobre el lat. chaos). 1. m. Fluido que tiende a expandirse indefinidamente y que se caracteriza por su pequeña densidad, como el aire. 2. Cada uno de los gases… …   Diccionario de la lengua española

  • gas — sustantivo masculino 1. (no contable) Área: química Estado de la materia cuyas moléculas están en desorden y pueden separarse indefinidamente por la escasa atracción que existe entre ellas: El agua se convierte en gas al evaporarse. 2. (no… …   Diccionario Salamanca de la Lengua Española

  • gas — [gæs] noun gases PLURALFORM or gasses [countable, uncountable] a substance which is not solid or liquid at normal temperatures, and which usually cannot be seen: • Greenhouse gases are the direct result of pollution …   Financial and business terms

  • gas — [gas] n. pl. gases or gasses [gas′iz] [ModL, altered by Van Helmont (1577 1644), Belgian chemist (with g pronounced, as in Du, as a voiced fricative) < Gr chaos, air (see CHAOS), term used by Paracelsus] 1. the fluid form of a substance in… …   English World dictionary

  • Gas CS — Nombre (IUPAC) sistemático …   Wikipedia Español

  • Gas — Gas. Die Eigenthümlichkeit der Gase, welche elastische Flüssigkeiten, Luftarten sind, besteht in dem Bestreben der kleinsten Theilchen, sich möglichst weit von einander zu entfernen, daher üben sie auf ihre Umgebung einen allseitigen Druck aus u …   Pierer's Universal-Lexikon

  • Gas — (g[a^]s), v. t. [imp. & p. p. {Gassed} (g[a^]st); p. pr. & vb. n. {Gassing}.] 1. (Textiles) To singe, as in a gas flame, so as to remove loose fibers; as, to gas thread. [Webster 1913 Suppl.] 2. To impregnate with gas; as, to gas lime with… …   The Collaborative International Dictionary of English