# Why has m/s changed in siunitx package?

I would have expected `\meter\per\second` to generate an output `m/s`. But when using the package `siunitx` the output is similar to ms^-1. I referred the documentation for the package and there too the latter is presented. What may be the reason for this? Do SI standards recommend it that way? Is the simple `m/s` obsolete?

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Perhaps the following serves as a reference: Derived units expressed in terms of base units –  Werner Sep 25 '12 at 5:27
Nothing has 'changed' in `siunitx`: this has always been the default. Perhaps you mean 'a difference in the standard settings between `siunitx` and `SIunits` is ...'. –  Joseph Wright Sep 25 '12 at 5:58

It is still possible tu use this notation in siunitx with the option `per-mode = symbol` and maybe also combining it with the option `bracket-unit-denominator = false` which will allow you to tell siunitx not to use brackets to delimit the denominator.
Pretty much spot-on. Note that the point of `siunitx` is to be flexible: I have to pick a default. Powers are most general, so are the standard setting. The package will add brackets to prevent ambiguity, but lots of brackets don't make for easy reading :-) –  Joseph Wright Sep 25 '12 at 5:56