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  2. Oxy-fuel welding and cutting - Wikipedia

    en.wikipedia.org/wiki/Oxy-fuel_welding_and_cutting

    Oxy-fuel torches are or have been used for: Heating metal: in automotive and other industries for the purposes of loosening seized fasteners. Neutral flame is used for joining and cutting of all ferrous and non-ferrous metals except brass.

  3. Pauli exclusion principle - Wikipedia

    en.wikipedia.org/wiki/Pauli_exclusion_principle

    The Pauli exclusion principle describes the behavior of all fermions (particles with half-integer spin), while bosons (particles with integer spin) are subject to other principles.