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Argon (18 Ar) has 26 known isotopes, from 29 Ar to 54 Ar, of which three are stable (36 Ar, 38 Ar, and 40 Ar). On the Earth, 40 Ar makes up 99.6% of natural argon. The longest-lived radioactive isotopes are 39 Ar with a half-life of 268 years, 42 Ar with a half-life of 32.9 years, and 37 Ar with a half-life of 35.04 days.
Production of the brand's petrol powered models began in 1950, with the introduction of the 10 HP SAME 4R/10 and the 20 HP 4R/20. 1952 saw the launch of the DA 25, the first mass-produced modern tractor with all-wheel drive , powered by a 25 HP, 2280 cm3 two cylinder diesel engine, with a 7 speed transmission and a top speed of 24.3 km/h.
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Argon–argon (or 40 Ar/ 39 Ar) dating is a radiometric dating method invented to supersede potassium–argon (K/Ar) dating in accuracy. The older method required splitting samples into two for separate potassium and argon measurements, while the newer method requires only one rock fragment or mineral grain and uses a single measurement of argon isotopes.
The Sherpa 2/3 was officially unveiled to the public at Eurosatory 2006 in Paris. [5] [6] with first production models made in 2007. [7] [8] In 2010, it changed the name from Sherpa 2 and 3 to Light. [9] [10] The Sherpa Light was shown in Asia in the BRIDEX 2011 convention alongside the VAB Mk II in Brunei on July 28, 2011. [11]
Argon is extracted industrially by the fractional distillation of liquid air in a cryogenic air separation unit; a process that separates liquid nitrogen, which boils at 77.3 K, from argon, which boils at 87.3 K, and liquid oxygen, which boils at 90.2 K. About 700,000 tonnes of argon are produced worldwide every year. [25] [35]
“Dancing With the Stars” hit a new milestone on Nov. 12, and revealed who was heading to the semifinals for Season 33. The 500th episode opened with pros — including returning favorite ...
FNSS Pars 4x4 Anti-tank at the IDEF 2019. The Pars ( Turkish for Anatolian leopard ) is an amphibious armoured combat vehicle family with 4×4, 6×6 and 8×8 versions, produced by FNSS Defence Systems of Turkey .