Question: How do I assign a global constant

I would like to define    k_ := 8.987551788*10^9*Unit('N'*'m'^2/'C'^2) as a global function so that it will be recognized in any new or old currect session.  Is there a way to do this in Maple?

See

AA11.mw

 attached to get a clearer idea of what I am describing.

Thank you

 

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