When you are producing a resource you don’t want a number at the end of a line with its unit on the next line or, even worse, the unit being split over two lines as in these examples:
To avoid this, don’t use a normal space between 0.25 and mol and dm–3. Instead use a non-breaking space by pressing Ctrl+Shift+spacebar. It looks exactly the same but the whole thing will not be spread over two lines so will look like this:
Chemistry Word VBA macros 