Re: SI prefixes with "accepted" units, others

Hello Neil,

On 12 Nov 2024, at 21:06, Neil Soiffer wrote:

> My conclusion is that only au, ha, l, t, Da, and eV accept SI prefixes 
> in practice. I'm definitely open to revising that if someone can show 
> that is not true (of course, people with do all sorts of "wrong" 
> things, but if enough people do that, then it is acceptable...).

I am surprised `ha` would carry SI prefixes since `ha` is “hundred 
ares” (an “are” is the surface of 10x10). Just as 1 hectolitre is 
100 litres.

> FYI: I hadn't realized this, but "neper" comes from "the neperian (or 
> natural) logarithm". The bel (named after Alexander Graham Bell) is 
> log_10. All typically reference some quantity (e.g., 3dbW) because 
> they are just ratios.

Erm… you mean. “All do not reference some quantity since they are 
just ratios” (Just as an angle)?  Right? (Or maybe you mean that the 
unit is implicit?)

Paul