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Why does the space after \AA disappear?

\documentclass{article}
\begin{document}
5 \AA wavelength
\end{document}

enter image description here

Since extra spaces don't achieve anything in LaTeX, what can be done besides forcing a space? Also, why is this symbol causing this affect?

marked as duplicate by Werner, Gonzalo Medina, David Carlisle, egreg symbols May 21 '14 at 21:57

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  • This is independent of the symbol, but a default behaviour of TeX - to gobble spaces after an argumentless control sequence. – Werner May 21 '14 at 21:39
  • @Werner so the space has to be forced then? – dustin May 21 '14 at 21:42
  • ...you can use \AA{}, then you don't technically force the space. – Werner May 21 '14 at 21:43
  • You should use siunitx for units, and the problem will disappear: \SI{5}{\angstrom} – egreg May 21 '14 at 21:58

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