> As I said, it's because the units chosen are not of a scale that is 
> convenient for every-day use,

Like what? mm, cm, m and km pretty much cover most things in terms of 
distance.  And having numbers that often go over 100 for everyday 
temperatures doesn't seem too convenient.

> and because 10 isn't really divisible by many numbers.

But everyone knows how to divide by 10, which I think is more useful.

It also makes physics equations easier, with no ugly scale factors.  Once I 
had the misfortune to come across a text book using American units, I nearly 
died looking at all those simple equations with horrendous scaling factors 
and units.

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