new SI prefixes

[alberto micol]

Mmhhh… 

I love Norman’s barn joke (a barn is as roomy as about 1Quetta barns), 
but this brings me to the following doubt, could you please clarify it to me?
 
Our VOUnit REC tells us we should use “barn” and not “b”
(see page 13 of https://www.ivoa.net/documents/VOUnits/20140523/VOUnits-REC-1.0-20140523.pdf <https://www.ivoa.net/documents/VOUnits/20140523/VOUnits-REC-1.0-20140523.pdf> ).

In that sense, while 1 Qb = 100 m**2    is correct in SI,
It seems to me that it is wrong to a VOUnits-compliant parser, where instead it should be written:
1 barn = 100 m**2

Unless I am reading the VOUnits document wrongly,
is this an issue for the VOUnits document?

Thanks and cheers, especially to François (given that I have no occasions to see him other than this)!
Alberto


> On 25 Nov 2022, at 17:39, Francois Ochsenbein <Francois.Ochsenbein at free.fr> wrote:
> 
> 
> Hi Norman,
> 
>> Sébastien and all hello.
>> 
>> On 25 Nov 2022, at 15:23, Sebastien Derriere wrote:
>> 
>>> Resolution 3 of the 27th CGPM introduces 4 new decimal prefixes :
>>> 
>>> https://www.bipm.org/en/cgpm-2022/resolution-3  
>> 
>> I've added <https://heptapod.host/nxg/unity/-/issues/13>
>> 
>>> R is also used for rayleigh, but because bare unit prefixes are
>>> ungrammatical,  
>> 
>> Indeed.  Bare 'R' would continue to parse as as rayleigh.
>> 
>>> I suggest these could be added to the Table 3 of the VOUnits
>>> document.  
>> 
>> And I agree.  And I see you've added
>> <https://github.com/ivoa-std/VOUnits/issues/21> (beat me to it!).
>> 
>> If my arithmetic is right, I see that the side of a rather large barn
>> has an area of approximately 1Qb.
> 
> ... in fact 1Qb = 100m² = a square of 10mx10m (1 are)
> 
> Cheers, François Ochsenbein (retired, but still reading VO news..)
> 
> -- 

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