I have an up-to-date MiKTeX 2.9 installation on Windows 10, and recently I came across a weird behavior of siunitx where inter-unit-product doesn't affect the output as shown below.

A couple of days ago, it was working but now it doesn't. So, what might be the reason?

P.S. The log file can be found here.

enter image description here


    inter-unit-product = \ensuremath{{}\cdot{}}

  • 3
    You've stuck random stuff inside the unit: it will force literal mode ...
    – Joseph Wright
    Nov 4, 2019 at 21:52
  • Just out of curiosity: Why do you surround \newton\m\s\per\radian with \left[ and \right]? Without those fences, the output of \SI is just fine.
    – Mico
    Nov 4, 2019 at 21:52
  • 1
    Side comment: The unit should never be put in square brackets.
    – Matthias
    Nov 4, 2019 at 21:52
  • 1
    @Mico I am experimenting, and seemingly I messed it up.
    – Diaa
    Nov 4, 2019 at 21:57
  • 1
    @Diaa No, because some people prefer not to use the unit macro.s You can forbid-literal-units if you wish
    – Joseph Wright
    Nov 4, 2019 at 21:58

1 Answer 1


If, for some unfathomable reason, you simply must encase scientific units in square brackets, you shouldn't do it as


Instead, do it as follows (in math mode, naturally):


That said, I would strongly recommend against encasing scientific units in square brackets.

  • 2
    Not only you, but rather the BIPM. ;-)
    – egreg
    Nov 5, 2019 at 0:05
  • May I know how to have control over the space surrounding the inter-product dot?
    – Diaa
    Dec 7, 2019 at 17:17
  • @Diaa - "Control over the space" is a rather broad objective. The option inter-unit-product = \ensuremath{{}\cdot{}} makes LaTeX insert a thinspace on either side of of \cdot, while inter-unit-product = \ensuremath{{\cdot}} instructs LaTeX to insert no whitespace at all.
    – Mico
    Dec 7, 2019 at 17:45
  • Thanks for the help. I rather found the space quite wide, which made me want to reduce it a bit without removing it at all.
    – Diaa
    Dec 7, 2019 at 19:20
  • @dias - My mind-reading skills are, sadly, rubbish. As a result, if a person asks me something but isn't clear about the objective, chances are nil that I will guess that objective correctly. :-( To get LaTeX to insert half a thinspace around \cdot, give inter-unit-product = \ensuremath{\mkern1.5mu\cdot\mkern1.5mu} a try. (Can you guess that 1thinspace=3mu?)
    – Mico
    Dec 7, 2019 at 19:51

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