| dist | distal; distill, distillation, distilled; distance; distribution; disturbance, disturbed |
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| AAP | air at atmospheric pressure; American Academy of Pediatrics; American Academy of Pedodontics; Americ... |
| API | alkaline protease inhibitor; Analytical Profile Index; arterial pressure index; atmospheric pressure... |
| atmos | atmospheric |
| LAP | laparoscopy; laparotomy; left arterial pressure; left atrial pressure; leucine aminopeptidase; leuke... |
| APCI | Atmospheric pressure chemical ionisation |
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| APCI-MS | Atmospheric pressure chemical ionization-mass spectrometry |
| LC-APCI-MS | Liquid chromatography-atmospheric pressure chemical ionization-mass spectrometry |
| API | atmospheric pressure ionisation |
| atmospheric | 1. Of or pertaining to the atmosphere; of the nature of, or resembling, the atmosphere; as, atmospheric air; the atmospheric envelope of the earth. 2. Existing in the atmosphere. "The lower atmospheric current." (Darwin) 3. Caused, or operated on, by the atmosphere; as, an atmospheric effect; an atmospheric engine. 4. Dependent on the atmosphere. "In am so atmospherical a creature." (Pope) Atmospheric engine, a steam engine whose piston descends by the pressure of the atmosphere, when the steam which raised it is condensed within the cylinder. <engineering> Atmospheric line, the equilibrium line of an indicator card. Steam is expanded "down to the atmosphere" when its pressure is equal to that of the atmosphere. (See Indicator card) Atmospheric pressure, the pressure exerted by the atmosphere, not merely downwards, but in every direction. In amounts to about 14.7 Ibs. On each square inch. Atmospheric railway, one in which pneumatic power, obtained from compressed air or the creation of a vacuum, is the propelling force. Atmospheric tides. See Tide. Origin: Cf. F. Atmospherique. Source: Websters Dictionary (01 Mar 1998) |
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| atmospheric pressure | The pressure at any point in an atmosphere due solely to the weight of the atmospheric gases above the point concerned. (12 Dec 1998) |
| molecular distillation | Distillation in high vacuum, intended to make possible use of low temperatures to minimise damage to thermally labile molecules that would be decomposed by boiling at higher temperatures. (05 Mar 2000) |
| destructive distillation | Submission of an organic substance to heat in a closed vessel so that oxygen is absent and combustion prevented, with the objective of effecting its decomposition with release of volatile constituents and the formation of new substances. Synonym: destructive distillation. (05 Mar 2000) |
| distillation | <technique> A lab technique used to purify a substance, to remove a solvent (a liquid that a substance is dissolved in) from the substance, or to separate two or more components in a liquid mixture. Ideally, this is done by taking advantage of the fact that the different chemicals have different boiling points. The temperature is raised so the chemical with the lowest boiling point boils first, its vapor is shunted out of the flask and towards a different container, and then it is cooled so that it condenses back into a (more purified) liquid. The temperature can then be raised to boil the next chemical, etc., until only the chemical with the highest boiling point remains in the original container. (11 Jan 1998) |
| dry distillation | Submission of an organic substance to heat in a closed vessel so that oxygen is absent and combustion prevented, with the objective of effecting its decomposition with release of volatile constituents and the formation of new substances. Synonym: destructive distillation. (05 Mar 2000) |
| fractional distillation | Distillation of a compound liquid at varying degrees of heat whereby the components of different boiling points are collected separately. (05 Mar 2000) |
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