ConTeXt: Increase word spacing in titles

Question

How can I increase word spacing? Preferably, I’d like them to be of a constant size, as I need it to improve legibility in uppercase titles (when increasing the kerning, the words are too close together).
The only way I managed to do it [2] [3] was with spaceskip, but that doesn’t work with nonbreaking spaces.
setuppapersize [S6]

starttext

setupalign[flushleft, nothyphenated, verytolerant]  
  tfdsetupinterlinespace

setcharactercasing[WORD]
  setcharacterkerning[extrakerning]
  spaceskip .5em

This is an~example.

stoptext

Jairo A. del Rio · Accepted Answer

ConTeXt, unlike LaTeX and plain TeX, defines ~ as a Unicode non-breaking space (U+00A0) with catcode 12 ("other"), so you shouldn't be surprised it's not being treated as a space in the TeX sense. Instead you need nonbreakablespace and, if this last command is to uncomfortable to write you may even do the following (better with grouping not to mess up things elsewhere):
%begingroup
%...
let~nonbreakablespace
%...
%endgroup

ConTeXt: Increase word spacing in titles

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