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  2. Air–fuel ratio - Wikipedia

    en.wikipedia.org/wiki/Air–fuel_ratio

    Air–fuel ratio (AFR) is the mass ratio of air to a solid, liquid, or gaseous fuel present in a combustion process. The combustion may take place in a controlled manner such as in an internal combustion engine or industrial furnace, or may result in an explosion (e.g., a dust explosion).

  3. List of chemical elements - Wikipedia

    en.wikipedia.org/wiki/List_of_chemical_elements

    118 chemical elements have been identified and named officially by IUPAC.A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z).

  4. Nitrogen - Wikipedia

    en.wikipedia.org/wiki/Nitrogen

    It is a common element in the universe, estimated at seventh in total abundance in the Milky Way and the Solar System. At standard temperature and pressure, two atoms of the element bond to form N 2, a colourless and odourless diatomic gas. N 2 forms about 78% of Earth's atmosphere, making it the most abundant chemical species in air. Because ...

  5. Pound sterling - Wikipedia

    en.wikipedia.org/wiki/Pound_sterling

    [24] [25] In the British pre-decimal currency system, the term £sd (or Lsd) for pounds, shillings and pence referred to the Roman libra, solidus, and denarius. [ 15 ] Notable style guides recommend that the pound sign be used without any abbreviation or qualification to indicate sterling (e.g., £12,000).

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