From Newsgroup: rec.puzzles

On Mon, 23 Jun 2025 15:57:14 -0000 (UTC), David Entwistle wrote:

So, the formal SI prefix for 10^30 is quetta and not quecca.

James has updated and corrected his web page, regarding the prefix quetta.

https://james.fabpedigree.com/yscaling.htm

He is looking for a good way to access USENET. I'll pass on a few
suggestions.
--
David Entwistle
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From Newsgroup: rec.puzzles

On Sat, 15 May 2021 13:23:24 +0000, James Dow Allen wrote:

This is NOT a puzzle. I'm posting here because I had (and still have?) friends
in this newsgroup who might be inspired to somehow devise a puzzle from
some of the information in the following webpage:
https://james.fabpedigree.com/yscaling.htm
It is a chart with three columns (the wavelength, energy, and
mass-equivalent of a photon) and 128 rows (for 128 orders of magnitude).

I produced the table to help me practice metric prefixes!

Dearest regards, James Dow Allen (mail address: jamesdowallen at gmail)

_____________________

that could be similar to what Smullyan called a Meta-puzzle.
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From Newsgroup: rec.puzzles

On Fri, 20 Jun 2025 02:54:05 +0000, HenHanna wrote:

This is NOT a puzzle. I'm posting here because I had (and still have?)
friends in this newsgroup who might be inspired to somehow devise a
puzzle from some of the information in the following webpage:
https://james.fabpedigree.com/yscaling.htm
It is a chart with three columns (the wavelength, energy, and
mass-equivalent of a photon) and 128 rows (for 128 orders of
magnitude).

Excellent information.

Have NPL'S website got quetta (Q) (10^30) wrong, or is that a language / usage thing?

https://www.npl.co.uk/resources/the-si-units/si-prefix

All the BIMP references I've seen confirm quecca for 10^30.
--
David Entwistle
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From Newsgroup: rec.puzzles

On Sat, 21 Jun 2025 05:59:29 -0000 (UTC), David Entwistle wrote:

On Fri, 20 Jun 2025 02:54:05 +0000, HenHanna wrote:

This is NOT a puzzle. I'm posting here because I had (and still
have?)
friends in this newsgroup who might be inspired to somehow devise a
puzzle from some of the information in the following webpage:
https://james.fabpedigree.com/yscaling.htm
It is a chart with three columns (the wavelength, energy, and
mass-equivalent of a photon) and 128 rows (for 128 orders of
magnitude).

Excellent information.

Have NPL'S website got quetta (Q) (10^30) wrong, or is that a language / usage thing?

https://www.npl.co.uk/resources/the-si-units/si-prefix

All the BIMP references I've seen confirm quecca for 10^30.

In response to a request for clarification, I have received the following information from the NPL, quoted without permission (I'm sure they won't mind).

<start quote>

Just wanted to follow up on your recent feedback submission to the NPL website.
I can confirm that the terminology on our website is correct and that the below are the official CGPM approved names/terminology for the new
prefixes:

quetta (symbol Q) for 10^30 or 1 000 000 000 000 000 000 000 000 000
000
quecto (symbol q) for 10^reA30 or 0.000 000 000 000 000 000 000 000 000 001

From your feedback form, you refer to quecca for 10^reA30, which is where I
am assuming the potential confusion lies. This was part of an original suggestion, which was then subsequently changed to quecto ahead of the
final CGPM vote, as 'queccarCO is quite close to a Portuguese profanity, (which is best avoided when the language is spoken by 250 million
globally!)

For more information, please see our news story related to the expansion:
SI Prefix expansion - NPL

https://www.npl.co.uk/news/si-prefix-expansion

<end quote>

So, the formal SI prefix for 10^30 is quetta and not quecca.

The BIPM articles I'd been looking at were probably discussion documents
and outdated.

Best wishes,
--
David Entwistle
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