Rochelle salt

Rochelle salt
Chem., Pharm.
a colorless or white, water-soluble solid, KNaC4H4O6·4H2O, used in silvering mirrors, in the manufacture of Seidlitz powders and baking powder, and in medicine as a laxative. Also called potassium sodium tartrate.
[1745-55; after LA ROCHELLE]

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also called  Sodium Potassium Tartrate Tetrahydrate,  

      a crystalline solid having a large piezoelectric effect (electric charge induced on its surfaces by mechanical deformation due to pressure, twisting, or bending), making it useful in sensitive acoustical and vibrational devices. Like other piezoelectric materials, Rochelle salt crystals (KNaC4H4O6·4H2O) become strained when subjected to electric fields. They decompose at moderately high temperatures (55° C [131° F]) and require protection against moisture. Piezoelectric deformation is directly proportional to the applied electric field and reverses as the polarity of the applied field is reversed. These basic properties are put to use in electromechanical transducers such as ultrasonic generators, microphones, and phonograph pickups and in electromechanical resonators. See also tartaric acid.

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Universalium. 2010.

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Look at other dictionaries:

  • Rochelle salt — Salt Salt, n. [AS. sealt; akin to OS. & OFries. salt, D. zout, G. salz, Icel., Sw., & Dan. salt, L. sal, Gr. ?, Russ. sole, Ir. & Gael. salann, W. halen, of unknown origin. Cf. {Sal}, {Salad}, {Salary}, {Saline}, {Sauce}, {Sausage}.] 1. The… …   The Collaborative International Dictionary of English

  • Rochelle salt — Rochelle Ro*chelle , n. A seaport town in France. [1913 Webster] {Rochelle powders}. Same as {Seidlitz powders}. {Rochelle salt} (Chem.), the double tartrate of sodium and potassium, a white crystalline substance. It has a cooling, saline,… …   The Collaborative International Dictionary of English

  • Rochelle-salt — Rochelleˈ salt noun Sodium potassium tartrate, discovered in 1672 by a Rochelle apothecary • • • Main Entry: ↑Rochelle …   Useful english dictionary

  • Rochelle salt — [rō shel′] n. [after La Rochelle, France, where discovered] a colorless crystalline compound, potassium sodium tartrate, KNaC4H4O6·4H2O, used as a laxative, in baking powders, and, in electronics, as a piezoelectric material …   English World dictionary

  • Rochelle salt — noun a double salt used in Seidlitz powder; acts as a cathartic • Syn: ↑Rochelle salts, ↑potassium sodium tartrate • Hypernyms: ↑double salt * * * Rochelle salt, a colorless or white, crystalline compound, potassium sodium tartrate, used as a… …   Useful english dictionary

  • Rochelle salt — Segneto druska statusas T sritis fizika atitikmenys: angl. Rochelle salt; Seignette salt vok. Rochellesalz, n; Seignettesalz, n rus. сегнетова соль, f pranc. sel de Rochelle, m; sel de Seignete, m …   Fizikos terminų žodynas

  • Rochelle salt — noun Etymology: La Rochelle, France Date: 1753 a crystalline salt KNaC4H4O6•4H2O that is a mild purgative …   New Collegiate Dictionary

  • Rochelle salt — Ro•chelle′ salt [[t]rəˈʃɛl, roʊ [/t]] n. chem. pha potassium sodium tartrate: a colorless or white, water soluble solid, KNaC4H4O6∙4H2O, used in silvering mirrors, in electronics, and as an ingredient in baking powder and laxatives • Etymology:… …   From formal English to slang

  • Rochelle salt — Ro·chelle salt rō shel n a crystalline salt C4H4KNaO6·4H2O that is a mild purgative called also potassium sodium tartrate, Seignette salt, sodium potassium tartrate …   Medical dictionary

  • Rochelle salt — noun The double salt potassium sodium tartrate that is used as a cathartic Syn: Seignette salt …   Wiktionary

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