Original poster: Ed Phillips <evp@xxxxxxxxxxx>SI requires use of just the powers of 1000,as above, but in practical use, you'll also see deci (=1/10th as in beer coming in a 3 deciliter glass) and centi (1/100th) as in cm."
The requirements [quite arbitrary and artificial dictates] of SI aren't convenient in many cases and the examples you give will stay in use forever I'm sure.
Ed