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The term inert gas is context-dependent because several of the inert gases, including nitrogen and carbon dioxide, can be made to react under certain conditions. [1] [2] Purified argon gas is the most commonly used inert gas due to its high natural abundance (78.3% N 2, 1% Ar in air) [3] and low relative cost.
This molecule may occur in the upper atmosphere. Experimentally the molecule is made from a low-pressure argon gas with 0.1% carbon dioxide, irradiated by a 150 V electron beam. Argon is ionized, and can transfer the charge to a carbon dioxide molecule. [36] The dissociation energy of ArCO + 2 is 0.26 eV. [36] ArCO + 2 + CO 2 → Ar + CO 2 ·CO +
Argon is a chemical element; it has symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas. [10] Argon is the third most abundant gas in Earth's atmosphere, at 0.934% (9340 ppmv).
Pyro was the leading manufacturer of military "bin toys" in the early 1950s. [4] Bin toys were relatively inexpensive items, usually an assortment of miniature green-plastic "army men", vehicles or accessories, packaged in poly bags, wholesaled in bulk, and sold "grab-bag-style" from large cardboard bins in retail stores.
[13] [86] The reduced amount of dissolved gas in the body means that fewer gas bubbles form during the decrease in pressure of the ascent. Another noble gas, argon, is considered the best option for use as a drysuit inflation gas for scuba diving. [87] Helium is also used as filling gas in nuclear fuel rods for nuclear reactors. [88] Goodyear Blimp
In 1946, Hawk produced one of the first all-plastic model kits, the Curtiss R3C-1 racer. [8] Four additional kits (all classic 1930s racers) were added in 1948; the Gee Bee, Howard Ike, Laird Solution and Supermarine S6B. These early kits were molded in acetate plastic, but from 1949 Hawk employed polystyrene in its injection-molding process. [9]
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In the mid- to late 1980s the monster model kit hobby grew toward the mainstream. By the 1990s, model kits were produced in the US and the UK, as well as in Japan, and distributed through hobby and comic stores. There was an unprecedented variety of licensed model figure kits. In the late 1990s, model kit sales went down.