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acid |
Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson | 0.10 sec. |
acidAny substance that in water solution tastes sour, changes the colour of acid-base indicators (e.g., litmus), reacts with some metals (e.g., iron) to yield hydrogen gas, reacts with bases to form salts, and promotes certain chemical reactions (e.g., acid catalysis). Acids contain one or more hydrogen atoms that, in solution, dissociate as positively charged hydrogen ions. Inorganic, or mineral, acids include sulfuric acid, nitric acid, hydrochloric acid, and phosphoric acid. Organic acids include carboxylic acids, phenols, and sulfonic acids. Broader definitions of acids cover situations in which water is not present. See also acid-base theory. (Atomic, Consistent, Isolated, Durable) The properties of a transaction in a well-designed database management system (DBMS). The transaction must be ATOMIC (all updating tasks must be completed or nothing is done), CONSISTENT (it cannot leave the database in a state that violates any integrity rules), ISOLATED (remain invisible to other operations until completed) and DURABLE (will complete or be reversed if the system fails in the interim).
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| After sloshing the solid mixture with strong acid -a process called wet etching - they rinsed away the dissolved graphite and determined the amount of acid-resistant material that remained: 67 percent by weight. ZEGERID offers a distinct pharmacological profile -- rapidly reaching maximal plasma levels (in approximately 30 minutes) and providing strong acid control, with a median 24-hour gastric pH of greater than 4 ranging from 12. The standard process for making conductive polyaniline creates large amounts of ammonium sulfate and leaves strong acid residues. |
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