John Graybeal jbgraybeal at mindspring.com
Wed May 27 12:34:31 MDT 2015

```Jim,

I think you go straight to the problem with using 1, or any number, as an indication of 'dimensionless'. If I can't create a meaningful result with linear math relations, than saying the unit is 1 invites difficulties.

That said, 1 seems better than .001. :-)

john

On May 27, 2015, at 11:19, Jim Biard <jbiard at cicsnc.org> wrote:

> Ah...
>
> So the issue here is that we could have salinity recorded as any one of:
> arbitrary unitless scale from 0.0 - 1000.0
> arbitrary unitless scale from 0.0 - 1.0
> parts per thousand
> grams per kilogram
> where by "arbitrary unitless scale" I mean it's a scale that doesn't have a direct linear relationship to parts per thousand or gram per kilogram.
> So, from a UDUNITS standpoint, this is a problem, because it (and ignorant me) happily assumes that units of '0.001', and 'g/kg' are equivalent and differ from '1' by a scale factor of 1000.
>
> Is this right?
>
> Grace and peace,
>
> Jim
>
>

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