Hi Gavin

Thank four your effort. I found out, that the following definition of a new unit, i called it SI, results also in a correct spaceing in the math environment:

\defineunit[SI][alternative=text]

It seems, that the option alternative=text solves the problem with no spaces between value and unit in the math environment.

Maybe this can be used to solve it easier in the code. I will have a look at phys-dim to solve it directly, if I find the time.

Best regards
Oli

> Am 12.10.2022 um 23:54 schrieb Gavin via ntg-context - ntg-context at ntg.nl <ntg-context_at_ntg_nl_vqmpumt@simplelogin.co>:
> 
> Hi Max, Alan, Bruce, Hans, et.al
> 
> I solved my four issues with \unit spacing. In the process, I prevented unwanted line breaks and removed an overzealous backspace before division symbols. Below is a MWE that shows all of these issues, as well as pictures of the result with the unmodified phys-dim.mkxl and with my modified phys-dim.mkxl. The final result is exactly what I wanted.
> 
> If anyone wants my changes, either for their own use or to improve the distributed phys-dim.mkxl, I’m happy to share.
> 
> Thanks for all of your comments!
> Gavin
> 
> 
> MWE:
> 
> \setuppapersize[A5]
> 
> \starttext
> 
> The \type{\unit} command in text produces \unit{1.23e5 kg m^2/s^2}.
> 
> Inline math \type{$\unit$} produces $\unit{1.23e5 kg m^2/s^2}$.
> 
> Display math produces
> \startformula
> \unit{1.23e5 kg m^2/s^2} + \unit{8.64e5 newton m} = \unit{987,000 joule}
> \stopformula
> 
> Line breaking in math:
> 
> {\hsize=0pt $G = \unit{6.6743e-11 m3 kg-1 s-2}$}
> 
> \blank
> Line breaking in text:
> 
> {\hsize=0pt \unit{6.6743e-11 m3 kg-1 s-2}}
> 
> \stoptext
> 
> Output with unmodified phys-dim.mkxl:
> <PastedGraphic-3.pdf>
> 
> Output with my modified phys-dim.mkxl:
> <PastedGraphic-2.pdf>
> 
> 
> 
>> On Oct 10, 2022, at 12:15 AM, Max Chernoff via ntg-context <ntg-context@ntg.nl> wrote:
>> 
>> Hi Alan,
>> 
>>> I would very strongly argue that the space between the number and the
>>> following units be UNBREAKABLE. Perhaps a thin space (preference), but
>>> most certainly non-breakable.
>>> 
>>> Similarly around the times in scientific notation.
>>> 
>>> I further cannot imagine that a line break be acceptable around a \cdot
>>> in composite units.
>>> 
>>> This can possibly lead to overfill and underfill, something that I find
>>> *infinitely* more acceptable then breaking numbers and units.
>> 
>> Yes, I agree completely here.
>> 
>>> I do not know or use the \units command. Maybe it uses unbreakable
>>> spaces, maybe not. I would never use it unless it could be configured
>>> to only use nonbreakable spaces.
>> 
>> The current behaviour doesn't break the unit from the number, but it
>> does split the scientific notation.
>> 
>> This test file:
>> 
>>  \starttext
>>  \hsize=0pt Math: $G = \unit{6.6743e-11 m3 kg-1 s-2}$
>> 
>>  \hsize=0pt Text: \unit{6.6743e-11 m3 kg-1 s-2}
>>  \stoptext
>> 
>> gives:
>> 
>>  Math:
>>  𝐺=
>>  6.6743×
>>  10–11m3⋅kg–1⋅s–2
>>  Text:
>>  6.6743
>>  ×
>>  10−11 m3⋅kg−1⋅s−2
>> 
>> which isn't great. In my opinion, the \unit command should be typeset in an
>> \hbox (or similar) since I can't think of any circumstances where breaking
>> it would be reasonable.
>> 
>> Thanks,
>> -- Max
>> ___________________________________________________________________________________
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>> 
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> 
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
> 
> maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context
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> ___________________________________________________________________________________