Fixed Range? Confusion at the term used in Persistant spell.

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Just what does a fixed range dictate? My friend and I have been having a discussion about it, and we saw the examples of comprehend languages and detect magic, however, would a persistant spell be able to keep something permanent all day long if in the spell descriptor had a range of say, 100ft +10 ft per level? Technically, if the spell has a specific range like 110 at lv 1, then doesn't that spell have a fixed range? Is this a fixed range or does this mean its short range spell? Just wondering how exactly you determine if its a fixed range or not. In advance sorry about saying fixed range so much.