[nitid_name]

I thought convention in SI units was to drop down a level when at less than 1 of a unit..?

[lytfyre]

A pretty common approach (at least in Canada) is to use prefixes at intervals of 1000 - mm, m, km and then larger unit to one decimal for large values - 700m as 0.7km, 0.9l instead on 900ml, and so-on.

you'll rarely see cl, dg, or hm used here.