My question here isn't asking about the ellipsis that can be replaced by a comma, and also not related to this: Why is em dash used here?, but more like asking, the difference between those three dots and a dash in terms of a long pause. Or probably it isn't a long pause, I don't know.
What I mean by dots, is something like this:
"You ... are ... adopted!", Said by Mother to her son.
I've seen someone (J.K Rowling) wrote like this quite often （the em dash), (please check the first book of Harry Potter). However, that makes me wondered is, she also used the three dots as well. Is this just inconsistency or something else I don't know the difference between?
"You —— are —— adopted!", Said by Mother to her son.
(I apologise if it looks like consecutive double — to you, since stackexchange has changed the output, though the input here the dash isn't separated, because, according to Wikipedia the em dash is 24 points wide.)
Actually, this question arose from this article: „[blind_man] A mathematician is a blind man in a dark room looking for a black cat which isn't there.“.
For instance, I don't know why they used the regular Dash here:
When I hear of an 'equity' in a case like this, I am reminded of a blind man in a dark room — looking for a black hat — which isn't there.
I just copied plainly from the page, so I myself am not quite sure what kind of dash that is. It's not long enough to be em dash, in my view. I also assume it's not an ellipsis since ...
When I hear of an 'equity' in a case like this, I am reminded of a blind man in a dark room which isn't there.
... doesn't have the same meaning when it's spoken.
Back to my original problem, are those punctuations interchangably used, or is there any difference?