@dmn{dimension}: Format a Dimension ¶You can use the @dmn command to format a dimension with just enough
space for proper typesetting inserted in printed output. In other output
formats, the formatting commands insert no space at all.
To use the @dmn command, write the number and then follow it
immediately, with no intervening space, by @dmn, and then by
the dimension within braces. For example,
A4 paper is 8.27@dmn{in} wide.
produces
A4 paper is 8.27in wide.
Not everyone uses this style. Some people prefer ‘8.27 in.’ or
‘8.27 inches’. In these cases, however, you need to use
@tie (see @tie{}: Inserting an Unbreakable Space) or @w (see @w{text}: Prevent Line Breaks)
so that no line break can occur between the number and the dimension.
Also, if you write a period after an abbreviation within a sentence
(as with the ‘in.’ above), you should write ‘@:’ after the
period to avoid inserting extra whitespace in printed output, as shown
here. See Not Ending a Sentence.