From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on ip-172-31-65-14.ec2.internal X-Spam-Level: X-Spam-Status: No, score=0.8 required=3.0 tests=BAYES_50,FREEMAIL_FROM, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Received: by 2002:a05:620a:12b3:b0:6f9:c3d9:311b with SMTP id x19-20020a05620a12b300b006f9c3d9311bmr42399141qki.498.1669823053647; Wed, 30 Nov 2022 07:44:13 -0800 (PST) X-Received: by 2002:ac8:7195:0:b0:39c:45c4:a7c7 with SMTP id w21-20020ac87195000000b0039c45c4a7c7mr57850198qto.388.1669823053434; Wed, 30 Nov 2022 07:44:13 -0800 (PST) Path: eternal-september.org!reader01.eternal-september.org!border-1.nntp.ord.giganews.com!nntp.giganews.com!news-out.google.com!nntp.google.com!postnews.google.com!google-groups.googlegroups.com!not-for-mail Newsgroups: comp.lang.ada Date: Wed, 30 Nov 2022 07:44:13 -0800 (PST) In-Reply-To: Injection-Info: google-groups.googlegroups.com; posting-host=94.31.100.23; posting-account=rmHyLAoAAADSQmMWJF0a_815Fdd96RDf NNTP-Posting-Host: 94.31.100.23 References: User-Agent: G2/1.0 MIME-Version: 1.0 Message-ID: <34d8c2dc-c989-4757-9a85-acc641681426n@googlegroups.com> Subject: Re: ANN: Units of measurement for Ada v3.12 (New SI prefixes) From: AdaMagica Injection-Date: Wed, 30 Nov 2022 15:44:13 +0000 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Xref: reader01.eternal-september.org comp.lang.ada:64664 List-Id: 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 e= xcess 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 (n= egative powers)? The what relevance has 1024? If it's binary units, negati= ve 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 bi= t and not 210 bit =3D 1024 bit. To alleviate this ambiguity, prefixes for b= inary multiples have been adopted by the International Electrotechnical Com= mission (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.