Invar


Invar
/in vahr"/, Trademark.
a brand of iron alloy containing 35.5 percent nickel and having a very low coefficient of expansion at atmospheric temperatures.

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Trademark name for an alloy of iron (64% iron, 36% nickel) that expands very little when heated.

Invar was formerly used for absolute standards of length measurement and is now used for surveying tapes and in watches and various other temperature-sensitive devices. The name expresses the invariability of its dimensions. It was developed by Charles-Édouard Guillaume (1861–1938), winner of the 1920 Nobel Prize for Physics.

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alloy
      alloy of iron that expands very little when heated; it contains 64 percent iron and 36 percent nickel. Invar was formerly used for absolute standards of length measurement and is now used for surveying tapes and in watches and various other temperature-sensitive devices. The trademark name was selected by the alloy's inventor, the Swiss physicist Charles-Édouard Guillaume, to express the invariability of its dimensions when heat is applied.

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Universalium. 2010.

Look at other dictionaries:

  • invar — invar …   Dictionnaire des rimes

  • Invar — Invar®, also known generically as FeNi36 (64FeNi in the US), is a nickel steel alloy notable for its uniquely low coefficient of thermal expansion (CTE or α). It was invented in 1896 by Swiss scientist Charles Édouard Guillaume. He received the… …   Wikipedia

  • invar — INVÁR s.n. Oţel aliat cu mult nichel, caracterizat printr o dilatare foarte mică şi folosit la fabricarea instrumentelor şi a aparatelor de precizie. – Din fr. invar. Trimis de valeriu, 21.07.2003. Sursa: DEX 98  invár s. n. Trimis de siveco, 10 …   Dicționar Român

  • invar — [ ɛ̃var ] n. m. • 1904; marque déposée , abrév. de invariable ♦ Techn. Acier au nickel, de dilatation très faible. ● Invar nom masculin (nom déposé [abréviation de invariable]) Alliage de fer à 36 % de nickel, dont le coefficient de dilatation… …   Encyclopédie Universelle

  • Invar — Invar, Verbindung von etwa 36% Nickel und 64% Stahl. Invar hat einen sehr geringen Ausdehnungswert, ändert also seine Ausdehnung bei Aenderung des Wärmezustandes nur sehr wenig, daher die Bezeichnung. Benoît und Guillaume fanden diese Verbindung… …   Lexikon der gesamten Technik

  • invar — (Del fr. invar, y este acort. de invariable, marca reg.). m. Aleación de hierro y níquel que, por su escaso coeficiente de dilatación, se emplea para instrumentos de medida y aparatos de precisión …   Diccionario de la lengua española

  • Invar — Invar, eine Nickelstahllegierung von sehr geringer Ausdehnung durch die Wärme, dient zu Meßinstrumenten …   Meyers Großes Konversations-Lexikon

  • invar — ìnvār m <G invára> DEFINICIJA legura željeza i nikla, s vrlo malim istezanjem; upotrebljava se u izradi preciznih instrumenata ETIMOLOGIJA tvorničko ime proizvoda© …   Hrvatski jezični portal

  • Invar — [in′vär΄] [abbrev. < INVARIABLE] trademark for a steel alloy containing approximately 36% nickel, used for making precision instruments and thermostatic elements because of its low coefficient of thermal expansion n. [i ] this substance …   English World dictionary

  • Invar® — /inˈvär or in värˈ/ noun An alloy of iron and nickel that expands only slightly when heated, used in the making of scientific instruments ORIGIN: From ↑invariable …   Useful english dictionary

  • Invar — Échantillons d Invar L Invar est un alliage de fer (64 %) et de nickel (36 %) dont la propriété principale est d avoir un coefficient de dilatation très faible. Cette invention est due au suisse Charles Edouard Guillaume, qui fut… …   Wikipédia en Français


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