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Showing definitions 31 to 40 of 85 for the letter 'a'

Alkenes The homologous series of aliphatic hydrocarbons containing one double (unsaturated) carbon-to carbon bond, consisting of ethene (C2H4), propene (C3H6), butane (C4H8) etc.; also known as the olefins. Alkyl The term used to describe an organic radical (group) consisting of an open carbon containing no unsaturated carbon-to-carbon bonds e.g. the methyl (CH3) and ethyl (C2H5) radicals. Alkylaromatic An organic compound consisting of an alkyl radical attached to an aromatic ring such as benzene. Alkynes The homologous series of aliphatic hydrocarbons containing one triple (unsaturated) carbon-to-carbon bond, consisting of ethyne (C2H2), propyne (C3H4), butyne (C4H6) etc. Alloy A composition of two or more metals. American Petroleum Institute I. Founded in 1920, this national oil trade organisation is the leading standardising organisation on oil field drilling and producing equipment. It maintains departments of transportation, refining, and marketing in Washington, DC., and a department of production in Dallas. 2. (Slang) indicative of a job being properly or thoroughly done (as, "His work is strictlyAPI"). 3. Degrees API; used to designate API gravity. See API gravity. Analogue Technique of representing a sensor's input as amplitude modulated electrical signal (e.g. analogue profiles are output on sweep recorders as opposed to digital). Anchor seal assembly A packer seal assembly with a threaded latch sleeve which matches the left hand square top thread of a permanent packer. By latching onto the packer the tubing is anchored to the packer. The anchor seal assembly can be released from the packer by right-hand rotation of the tubing. Angle of deflection In directional drilling, the angle, expressed in degrees, at which a well is deflected from the vertical by whipstock or other deflecting tool. See whipstock. Anhydrous A substance which contains no water.

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