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  2. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    The term myriometer (abbr. mom, equivalent to 100 micrometers; frequently confused with the myriameter, 10 kilometers) [97] is deprecated; the decimal metric prefix myrio-[98] is obsolete [99] [100] [101] and was not included among the prefixes when the International System of Units was introduced in 1960. 100 μm – 1/10 of a millimeter

  3. Gold as an investment - Wikipedia

    en.wikipedia.org/wiki/Gold_as_an_investment

    The sizes of bullion coins range from 0.1 to 2 troy ounces (3.1 to 62.2 g), with the 1 troy ounce (31 g) size being most popular and readily available. [ citation needed ] The Krugerrand is the most widely held gold bullion coin, with 46 million troy ounces (1,400 tonnes) in circulation.

  4. Imperial units - Wikipedia

    en.wikipedia.org/wiki/Imperial_units

    The former Weights and Measures office in Seven Sisters, London (590 Seven Sisters Road). The imperial system of units, imperial system or imperial units (also known as British Imperial [1] or Exchequer Standards of 1826) is the system of units first defined in the British Weights and Measures Act 1824 and continued to be developed through a series of Weights and Measures Acts and amendments.

  5. Jewellery Quarter - Wikipedia

    en.wikipedia.org/wiki/Jewellery_Quarter

    The number of jewellers in the area reduced significantly in the 1820s as a result of economic problems in the 1820s and many jewellers were made redundant as firms decreased in size to survive. The effects were felt for the following ten years and Hockley only developed as a distinct "quarter" at the centre of the city's jewellery industry ...

  6. Duodecimal - Wikipedia

    en.wikipedia.org/wiki/Duodecimal

    The duodecimal system, also known as base twelve or dozenal, is a positional numeral system using twelve as its base.In duodecimal, the number twelve is denoted "10", meaning 1 twelve and 0 units; in the decimal system, this number is instead written as "12" meaning 1 ten and 2 units, and the string "10" means ten.

  7. Lead glass - Wikipedia

    en.wikipedia.org/wiki/Lead_glass

    Cut glass wine glass made of lead glass. Lead glass, commonly called crystal, is a variety of glass in which lead replaces the calcium content of a typical potash glass. [1] Lead glass contains typically 18–40% (by mass) lead(II) oxide (PbO), while modern lead crystal, historically also known as flint glass due to the original silica source, contains a minimum of 24% PbO. [2]

  8. Health effects of radon - Wikipedia

    en.wikipedia.org/wiki/Health_effects_of_radon

    One WLM is equivalent to 3.6 × 10 −3 J·h/m 3. An exposure to 1 WL for 1 working month (170 hours) equals 1 WLM cumulative exposure. A cumulative exposure of 1 WLM is roughly equivalent to living one year in an atmosphere with a radon concentration of 230 Bq/m 3. [6] The radon (222 Rn) released into the air decays to 210 Pb and other ...

  9. Arunachal Pradesh - Wikipedia

    en.wikipedia.org/wiki/Arunachal_Pradesh

    Arunachal Pradesh (/ ər ʊ ˌ n ɑː tʃ əl p r ə ˈ d eɪ ʃ /; [10] lit. ' Dawn-Lit Mountain Province ') [11] is a state in northeast India.It was formed from the North-East Frontier Agency (NEFA) region, and India declared it as a state on 20 February 1987.