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  2. Argon - Wikipedia

    en.wikipedia.org/wiki/Argon

    Ar in Earth's atmosphere, which is only 31.5 ppmv (= 9340 ppmv × 0.337%), comparable with that of neon (18.18 ppmv) on Earth and with interplanetary gasses, measured by probes. The atmospheres of Mars, Mercury and Titan (the largest moon of Saturn) contain argon, predominantly as 40 Ar. [29] The predominance of radiogenic 40

  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. Paschen's law - Wikipedia

    en.wikipedia.org/wiki/Paschen's_law

    Paschen's law is an equation that gives the breakdown voltage, that is, the voltage necessary to start a discharge or electric arc, between two electrodes in a gas as a function of pressure and gap length. [2] [3] It is named after Friedrich Paschen who discovered it empirically in 1889. [4]

  5. Argon compounds - Wikipedia

    en.wikipedia.org/wiki/Argon_compounds

    Ar-NCCN argon–cyanogen van der Waals complex centre of molecule 3.58 90° T shape 30 cm −1: 0.0979 [63] DCCDAr argon-deuterated acetylene centre of molecule 3.25 90° T shape 0.0008 mdyn/Å / 8.7 cm −1 [63] SO 3 Ar sulfur trioxide argon S 3.350 on axis 90° from SO bond 0.059 mdyn/Å / 61 cm −1 [80] Ar•HCCH acetylene argon T shape [81 ...

  6. Atomicity (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Atomicity_(chemistry)

    Atomicity is the total number of atoms present in a molecule of an element. For example, each molecule of oxygen (O 2) is composed of two oxygen atoms.Therefore, the atomicity of oxygen is 2.

  7. Heat treating - Wikipedia

    en.wikipedia.org/wiki/Heat_treating

    Heat treating furnace at 1,800 °F (980 °C) Heat treating (or heat treatment) is a group of industrial, thermal and metalworking processes used to alter the physical, and sometimes chemical, properties of a material.

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