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  2. Prices of chemical elements - Wikipedia

    en.wikipedia.org/wiki/Prices_of_chemical_elements

    This is a list of prices of chemical elements. Listed here are mainly average market prices for bulk trade of commodities. Data on elements' abundance in Earth's crust is added for comparison. As of 2020, the most expensive non-synthetic element by both mass and volume is rhodium.

  3. Nitromethane - Wikipedia

    en.wikipedia.org/wiki/Nitromethane

    Nitromethane is used as a fuel in motor racing, particularly drag racing, as well as for radio-controlled model power boats, cars, planes and helicopters. In this context, nitromethane is commonly referred to as "nitro fuel" or simply "nitro", and is the principal ingredient for fuel used in the "Top Fuel" category of drag racing. [14]

  4. Nines (notation) - Wikipedia

    en.wikipedia.org/wiki/Nines_(notation)

    For example, a N2.0 gas is 99% (two nines) pure and 1% impurities by volume; a N6.0 gas is 99.9999% (six nines) pure, with 1 part per million (1 ppm or 1 vpm, volume per million) impurities. [7] Intermediate values indicate the digit following the last nine. For example, N4.6 estimates a purity level of 99.996% (four nines followed by a six). [7]

  5. Ammonia production - Wikipedia

    en.wikipedia.org/wiki/Ammonia_production

    In 2018, high oil prices resulted in an extended summer shutdown of European ammonia factories causing a commercial CO 2 shortage, thus limiting production of CO 2-based products such as beer and soft drinks. [30] This situation repeated in September 2021 due to a 250-400% increase in the wholesale price of natural gas over the course of the year.

  6. Fineness - Wikipedia

    en.wikipedia.org/wiki/Fineness

    A refiner doing $1 billion of business each year that marked .980 pure bars as .999 fine would make about an extra $20 million in profit. In the United States, the actual purity of gold articles must be no more than .003 less than the marked purity (e.g. .996 fine for gold marked .999 fine), and the actual purity of silver articles must be no ...

  7. Methanogen - Wikipedia

    en.wikipedia.org/wiki/Methanogen

    Methanogens are anaerobic archaea that produce methane as a byproduct of their energy metabolism, i.e., catabolism.Methane production, or methanogenesis, is the only biochemical pathway for ATP generation in methanogens.

  8. Chill guy - Wikipedia

    en.wikipedia.org/wiki/Chill_guy

    The artwork consists of a brown dog with a human figure, wearing a grey crew neck sweater, blue jeans, and dirty red Converse shoes. [1] [2] [4] [5] He is smirking with his hands in his pocket, with the caption written by Banks that he is a "chill guy".

  9. 97.5th percentile point - Wikipedia

    en.wikipedia.org/wiki/97.5th_percentile_point

    95% of the area under the normal distribution lies within 1.96 standard deviations away from the mean.. In probability and statistics, the 97.5th percentile point of the standard normal distribution is a number commonly used for statistical calculations.