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In chemistry, absolute configuration refers to the spatial arrangement of atoms within a molecular entity (or group) that is chiral, and its resultant stereochemical description. [1] Absolute configuration is typically relevant in organic molecules where carbon is bonded to four different substituents .
Also acid ionization constant or acidity constant. A quantitative measure of the strength of an acid in solution expressed as an equilibrium constant for a chemical dissociation reaction in the context of acid-base reactions. It is often given as its base-10 cologarithm, p K a. acid–base extraction A chemical reaction in which chemical species are separated from other acids and bases. acid ...
This glossary of chess explains commonly used terms in chess, in alphabetical order.Some of these terms have their own pages, like fork and pin.For a list of unorthodox chess pieces, see Fairy chess piece; for a list of terms specific to chess problems, see Glossary of chess problems; for a list of named opening lines, see List of chess openings; for a list of chess-related games, see List of ...
1. A position half way along the length of a ship or boat. [14] 2. A position half way between the port and starboard sides of a ship or boat, as in "helm amidships", when the rudder is in line with the keel. [14] ammunition ship A naval auxiliary ship specifically configured to carry ammunition, usually for combatant ships and aircraft.
Screenshot of the CAS Common Chemistry database with information about caffeine ().. A CAS Registry Number [1] (also referred to as CAS RN [2] or informally CAS Number) is a unique identification number, assigned by the Chemical Abstracts Service (CAS) in the US to every chemical substance described in the open scientific literature, in order to index the substance in the CAS Registry.
A bumpy surface can always be made bumpier. A truly flat surface, however, can never be made flatter. Colloquially, he acknowledges, we do say things like "surface A is flatter than surface B", but this is just a shorter way of saying "surface A is closer to being flat than surface B". This paraphrasing, however, doesn't work for relative terms.
RN: the Memoirs of Richard Nixon, an autobiography of 37th U.S. President Richard M. Nixon. (1913-1994, served 1969-1974), published 1978; Registered Identification Number, a US FTC code used on clothing labels; RN, then IATA code of Air Horizons, a former French airline; RN, then IATA code of Rayani Air, a former Malaysian airline
Temperature is a physical quantity that quantitatively expresses the attribute of hotness or coldness.Temperature is measured with a thermometer.It reflects the average kinetic energy of the vibrating and colliding atoms making up a substance.