Yes, you are right, Paul. It's not a ratio. I'll take it back. Is there any way to literally read "Space/Line = 5/5 nm"?Ratios are absolute numbers - they have no units.
The usual separator for a ratio is a colon -> 5:5
"Space:Line = 5:5" however, this is an imperfect ratio as the ratio is actually, 1:1
What you are describing is not a ratio; it is comparative widths, so "There is 5nm between the lines, which themselves are 5nm wide."
I saw this in an academic conference for organic device engineering, but then it was written by a non-native speaker of English. (And the speaker was talking about how precisely the new processing technique can fabricate devices)Have you seen this written somewhere? Or did you write this? (You know, source/context etc). The search I did has such things acompanied by "pattern" or "spacing" etc. Are you planning to read it aloud to communicate to others? Will it be accompanied by other (con)text?
(nanometre/nanometer is one word not two!)
Thanks for the new knowledge, Egmont. Much appreciated!The notation you suggest is related to typesetting notation, but it's different. In typesetting, the notation "12/16" means to use 12-point type on lines spaced 16 points apart. However, there's a difference: the 16 points is the total line spacing, baseline to baseline, including the height of the text - so, if all the letters were 12 points tall, there would be 4 points space between the bottom of one and the top of the one below it. You seem to mean only the space between lines, not including the width of the lines themselves. In typesetting notation, that would be 5/10.
I urge you not to borrow this notation. It's from another field, you're using it differently, and circuit layout engineers will not (in my experience) have any idea what it means. I'd write "5nm lines with 5nm spacing between them." If you will have to say this many times, you can use a more compact notation - but, if you do that, define it first.