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I know [単位](https://jisho.org/word/%E5%8D%98%E4%BD%8D) can indicate unit of
measurement, but I can't really understand what does it adds, and if it's
needed or something extra; I also tried on
[Weblio](https://www.weblio.jp/content/%E5%8D%98%E4%BD%8D), but while I
understand the definition, I don't really understand its usage.

Here's an example; as context, an alien is approaching the spaceship, and the
commander asks about its distance; the answer is:

> あと9000キロ単位です

What I don't understand is: would the sentence be grammatical also without 単位,
like "あと9000キロです"? If yes, what does it add? If not, is there any case in
which removing it is right? I think for example about the title
"いつだって僕らの恋は10センチだった".
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question
meaning words
Meaning and usage of 単位
[This website](https://anime-
diary.net/sidonia/%E3%82%B7%E3%83%89%E3%83%8B%E3%82%A2%E3%81%AE%E9%A8%8E%E5%A3%AB%E3%81%AE%E3%80%8C%E5%8D%98%E4%BD%8D%E3%80%8D.html)
says a manga uses キロ単位 in the literal sense: 1000 x unit length, where there
is no indication of what the unit length is. In this particular manga, キロ単位
seems different from _km_. So 9000キロです is of course grammatical, but would
mean the usual 9000km.

I don't think it is common to use キロ this way. (I knew the manga, but never
really thought what exactly it meant.)

* * *

In terms of ordinary usage, 1キロ単位 would be used like 1キロ単位で売る= _sell by the
kilo_ (that is, it is not possible to buy 1500g for example).

Another usage which is kind of similar is 単位当たり= _per unit_. This 単位 means a
unit, which can be different depending on the context.
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answer