Length. The en dash is the length of the letter n while the emdash is (you
guessed it!) the length of the letter m.
When to use one or the other is a matter of style. Go to web and locate
Chicago Univ style as an example.

best wishes

--
Bernard Liengme
www.stfx.ca/people/bliengme
remove CAPS in email address


"PreciousIvy" wrote in message
...
What is the difference between an en dash and an em dash?