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  • ANN: Units of measurement for Ada v3.12 (New SI prefixes)

    From Dmitry A. Kazakov@21:1/5 to All on Sat Nov 26 23:11:57 2022
    The library provides measurement unit support for Ada.

    http://www.dmitry-kazakov.de/ada/units.htm

    Changes to the previous version:

    - Added four new SI prefixes adopted by General Conference on Weights
    and Measures (CGPM) in November 2022.

    --
    Regards,
    Dmitry A. Kazakov
    http://www.dmitry-kazakov.de

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  • From AdaMagica@21:1/5 to All on Wed Nov 30 07:44:13 2022
    This is a bit confusting. From https://www.lne.fr/en/news/general-conference-weights-and-measures-2022:

    to express quantities of digital information using orders of magnitude in excess of 1024, has been adopted.

    Thus, four new prefixes have been introduced:

    ronna pour 1027
    ronto pour 10-27
    quetta pour 1030
    quecto pour 10-30
    End quote.

    Abbreviations?
    What does the reference to 1024 mean? Does it mean power of ten prefixes (negative powers)? The what relevance has 1024? If it's binary units, negative powers are nonsense.

    From
    https://physics.nist.gov/cuu/Units/prefixes.html:

    Because the SI prefixes strictly represent powers of 10, they should not be used to represent powers of 2. Thus, one kilobit, or 1 kb a it, is 1000 bit and not 210 bit = 1024 bit. To alleviate this ambiguity, prefixes for binary multiples have been
    adopted by the International Electrotechnical Commission (IEC) for use in information technology.
    End quote.

    You can find the binary prefixes in: https://physics.nist.gov/cuu/Units/binary.html

    There is not yet a word to be found about the above prefixes.

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  • From Dmitry A. Kazakov@21:1/5 to AdaMagica on Wed Nov 30 18:03:36 2022
    On 2022-11-30 16:44, AdaMagica wrote:
    This is a bit confusting. From https://www.lne.fr/en/news/general-conference-weights-and-measures-2022:

    to express quantities of digital information using orders of magnitude in excess of 1024, has been adopted.

    Thus, four new prefixes have been introduced:

    ronna pour 1027
    ronto pour 10-27
    quetta pour 1030
    quecto pour 10-30
    End quote.

    Abbreviations?

    q, r, R, Q

    What does the reference to 1024 mean? Does it mean power of ten prefixes (negative powers)? The what relevance has 1024? If it's binary units, negative powers are nonsense.

    Mistranslation from French? (:-))

    --
    Regards,
    Dmitry A. Kazakov
    http://www.dmitry-kazakov.de

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  • From AdaMagica@21:1/5 to AdaMagica on Wed Nov 30 09:17:27 2022
    AdaMagica schrieb am Mittwoch, 30. November 2022 um 16:44:14 UTC+1:
    This is a bit confusting. From https://www.lne.fr/en/news/general-conference-weights-and-measures-2022:

    to express quantities of digital information using orders of magnitude in excess of 1024, has been adopted.

    Now I see, this is 10**24.

    I'm wondering when these prefixes will turn up in https://physics.nist.gov/cuu/Units/prefixes.html.

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  • From Jeffrey R.Carter@21:1/5 to AdaMagica on Wed Nov 30 18:18:18 2022
    On 2022-11-30 16:44, AdaMagica wrote:
    This is a bit confusting. From https://www.lne.fr/en/news/general-conference-weights-and-measures-2022:

    to express quantities of digital information using orders of magnitude in excess of 1024, has been adopted.

    Thus, four new prefixes have been introduced:

    ronna pour 1027
    ronto pour 10-27
    quetta pour 1030
    quecto pour 10-30
    End quote.

    What does the reference to 1024 mean? Does it mean power of ten prefixes (negative powers)? The what relevance has 1024? If it's binary units, negative powers are nonsense.

    I suspect the numbers of the form 10xx originally had xx as a superscript which was lost in translation, or 10 ** xx in Ada. Similarly, 10-xx would be 10 ** (-xx).

    --
    Jeff Carter
    "Now go away or I shall taunt you a second time."
    Monty Python & the Holy Grail
    07

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  • From AdaMagica@21:1/5 to All on Wed Nov 30 09:49:48 2022
    I'm wondering when these prefixes will turn up in https://physics.nist.gov/cuu/Units/prefixes.html.
    You can find them here:
    https://www.bipm.org/en/measurement-units/si-prefixes

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