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• Argon Zark! — Infobox webcomic| title = Argon Zark! caption = author = Charley Parker url = http://www.zark.com status = Irregularly began = June 1995 ended = genre = ratings = Argon Zark! is a webcomic, created by cartoonist and web site designer Charley… …   Wikipedia

• Argon — This article pertains to the chemical element. For other uses, see Argon (disambiguation). Argon (pronEng|ˈɑrgɒn) is a chemical element designated by the symbol Ar. Argon has atomic number 18 and is the third element in group 18 of the periodic… …   Wikipedia

• Isotopes of argon — The main isotopes of argon (Ar) found on Earth are 40Ar, 36Ar, and 38Ar. Naturally occurring 40K with a half life of 1.250e|9 years, decays to stable 40Ar (11.2%) by electron capture and by positron emission, and also transforms to stable 40Ca… …   Wikipedia

• The Eye of Argon — infobox Book | name = The Eye of Argon title orig = translator = image caption = author = Jim Theis illustrator = cover artist = country = US language = English series = genre = Heroic fantasy publisher = Wildside Press (2006 reprint) release… …   Wikipedia

• Potassium-argon dating — or K Ar dating is a radiometric dating method used in geochronology and archeology. It is based on measuring the products of the radioactive decay of potassium (K), which is a common element found in materials such as micas, clay minerals, tephra …   Wikipedia

• potassium-argon dating — /peuh tas ee euhm ahr gon/, Geol. a method for estimating the age of a mineral or rock, based on measurement of the rate of decay of radioactive potassium into argon. [1965 70] * * * Method for determining the age of igneous rocks based on the… …   Universalium

• Penning mixture — A Penning mixture (Harv|Weston|1968|p=334,Harv|Bylander|1979|p=65), named after Frans Michel Penning, is a mixture of gases used in electric lighting or displaying fixtures. Although the popular phrase for the most common of these is a neon lamp …   Wikipedia

• Atmosphere of Mars — Chemical species mole fraction Carbon dioxide 95.32% Nitrogen 2.7% Argon …   Wikipedia

• steel — steellike, adj. /steel/, n. 1. any of various modified forms of iron, artificially produced, having a carbon content less than that of pig iron and more than that of wrought iron, and having qualities of hardness, elasticity, and strength varying …   Universalium

• dating — I In geology and archaeology, the process of determining an object s or event s place within a chronological scheme. Scientists may use either relative dating, in which items are sequenced on the basis of stratigraphic clues (see stratigraphy) or …   Universalium

• Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry       The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …   Universalium