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  2. Closed-cycle gas turbine - Wikipedia

    en.wikipedia.org/wiki/Closed-cycle_gas_turbine

    ~ mechanical load, e.g. electric generator. A closed-cycle gas turbine is a turbine that uses a gas (e.g. air, nitrogen, helium, argon, [1] [2] etc.) for the working fluid as part of a closed thermodynamic system. Heat is supplied from an external source. [3] Such recirculating turbines follow the Brayton cycle. [4] [5]

  3. Argon–argon dating - Wikipedia

    en.wikipedia.org/wiki/Argonargon_dating

    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.

  4. Isotopes of argon - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_argon

    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.

  5. Industrial gas - Wikipedia

    en.wikipedia.org/wiki/Industrial_gas

    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 ...

  6. Argon - Wikipedia

    en.wikipedia.org/wiki/Argon

    Argon gas-discharge lamp forming "Ar", the symbol for argon Incandescent lights are filled with argon, to preserve the filaments at high temperature from oxidation. It is used for the specific way it ionizes and emits light, such as in plasma globes and calorimetry in experimental particle physics .

  7. Noble gas - Wikipedia

    en.wikipedia.org/wiki/Noble_gas

    [97] [103] 21 Ne and 22 Ne are produced in the earth's crust as a result of interactions between alpha and neutron particles with light elements; 18 O, 19 F and 24,25 Mg. [104] The neon ratios (20 Ne/ 22 Ne and 21 Ne/ 22 Ne) are systematically used to discern the heterogeneity in the Earth's mantle and volatile sources. Complimenting He isotope ...

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