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Descriptor in English: Gases
Descriptor in Spanish: Gases
Descriptor in Portuguese: Gases
Descriptor in French: Gaz
Tree number(s): D01.362
SP4.031.100.200.247.458.014
SP4.097.069
SP8.473.654.412.052.065
Scope note: The vapor state of matter; nonelastic fluids in which the molecules are in free movement and their mean positions far apart. Gases tend to expand indefinitely, to diffuse and mix readily with other gases, to have definite relations of volume, temperature, and pressure, and to condense or liquefy at low temperatures or under sufficient pressure. (Grant & Hackh's Chemical Dictionary, 5th ed)
Annotation: does not include natural gas ( = NATURAL GAS see FOSSIL FUELS); does not include blood gases ( = OXYGEN /blood or CARBON DIOXIDE /blood); gas embolism = EMBOLISM, AIR; intestinal gases = GASES + INTESTINES /physiol unless clinically referred to as FLATULENCE (Cat C)
Allowable Qualifiers: AD administration & dosage
AE adverse effects
AG agonists
AI antagonists & inhibitors
AN analysis
BL blood
CF cerebrospinal fluid
CH chemistry
CL classification
CS chemical synthesis
EC economics
HI history
IM immunology
IP isolation & purification
ME metabolism
PD pharmacology
PK pharmacokinetics
RE radiation effects
SD supply & distribution
ST standards
TO toxicity
TU therapeutic use
UR urine
DeCS UI: 5881
Descriptor UI: D005740
Date Established: 1966/01/01
Date of Entry: 1999/01/01
Revision Date: 2014/06/27
Gases - Preferred
Concept UI M0008995
Scope note The vapor state of matter; nonelastic fluids in which the molecules are in free movement and their mean positions far apart. Gases tend to expand indefinitely, to diffuse and mix readily with other gases, to have definite relations of volume, temperature, and pressure, and to condense or liquefy at low temperatures or under sufficient pressure. (Grant & Hackh's Chemical Dictionary, 5th ed)
Preferred term Gases



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