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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.
The term “industrial gases” [32] is sometimes narrowly defined as just the major gases sold, which are: nitrogen, oxygen, carbon dioxide, argon, hydrogen, acetylene and helium. [33] Many names are given to gases outside of this main list by the different industrial gas companies, but generally the gases fall into the categories "specialty ...
Richard Piries Company is the market leader and the pioneer in the tyre Retread industry of Sri Lanka and commands a market share of nearly 60%. In addition to that, it has become the largest Retreader in the whole of South Asia which is a remarkable achievement for a Sri Lankan company.
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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.
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BYU is one of four Big 12 teams in the initial rankings ahead of No. 17 Iowa State, No. 19 Kansas State and No. 20 Colorado. First-round games. No. 12 Boise State at No. 5 Ohio State.
Ar-NCCN argon–cyanogen van der Waals complex centre of molecule 3.58 90° T shape 30 cm −1: 0.0979 [62] DCCDAr argon-deuterated acetylene centre of molecule 3.25 90° T shape 0.0008 mdyn/Å / 8.7 cm −1 [62] SO 3 Ar sulfur trioxide argon S 3.350 on axis 90° from SO bond 0.059 mdyn/Å / 61 cm −1 [79] Ar•HCCH acetylene argon T shape [80 ...