nitrous vapours

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• nitrous oxide — N2O; a nonflammable, nonexplosive gas that will support combustion; widely used as a rapidly acting, rapidly reversible, nondepressant, and nontoxic inhalation analgesic to supplement other anesthetics and analgesics; its anesthetic potency alone …   Medical dictionary

• Inhalant — Inhalants are a broad range of drugs in the forms of gases, aerosols, or solvents which are breathed in and absorbed through the lungs. While some inhalant drugs are used for medical purposes, as in the case of nitrous oxide (a dental… …   Wikipedia

• anesthesia — /an euhs thee zheuh/, n. 1. Med. general or local insensibility, as to pain and other sensation, induced by certain interventions or drugs to permit the performance of surgery or other painful procedures. 2. Pathol. general loss of the senses of… …   Universalium

• medicine, history of — Introduction  the development of the prevention and treatment of disease from prehistoric and ancient times to the 20th century. Medicine and surgery before 1800 Primitive (primitive culture) medicine and folklore       Unwritten history is not… …   Universalium

• Anaesthesia —     Anæsthesia     † Catholic Encyclopedia ► Anæsthesia     (From Greek a, privative, and aisthesis, feeling).     A term in medicine, and the allied sciences, signifying a state of insensibility to external impressions, consequent upon disease,… …   Catholic encyclopedia

• Poppers — For other uses, see Popper (disambiguation). Variety of popper brands Poppers is a slang term for various alkyl nitrites inhaled for recreational purposes, particularly isopropyl nitrite (2 propyl nitrite) and isobutyl nitrite (2 methylpropyl… …   Wikipedia

• atmosphere, evolution of — Introduction  the development of Earth s (Earth) atmosphere across geologic time. The process by which the current atmosphere arose from earlier conditions is complex; however, evidence related to the evolution of Earth s atmosphere, though… …   Universalium

• John Dalton — For other people named John Dalton, see John Dalton (disambiguation). John Dalton …   Wikipedia

• Volatile anaesthetic — The volatile anaesthetics are a class of general anaesthetic drugs. They share the property of being liquid at room temperature, but evaporating easily for administration by inhalation (some experts make a distinction between volatile and gas… …   Wikipedia

• Minimum alveolar concentration — or MAC is a concept used to compare the strengths, or potency, of anaesthetic vapours;[1] in simple terms, it is defined as the concentration of the vapour in the lungs that is needed to prevent movement (motor response) in 50% of subjects in… …   Wikipedia

• nitric oxide — Chem. a colorless, slightly water soluble gas, NO, formed by the action of dilute nitric acid on copper, and by the direct combination of atmospheric oxygen and nitrogen at the high temperatures of an electric arc: an intermediate in the… …   Universalium