Andy,
the use of those length units depends on the circle who uses them.
Woodworkers use cm, metalworkers mm, opticians micrometers, nuclear
scientists nanometers. The aim is to leave off unused zeroes, either in
front or after the decimal point. Hectoliters are the most important
measure of beer hereabouts because it is convenient to simply count
barrels instead pouring beer in bulky liquid measures, and Austrian
houewives buy their sausage and meat in Deka's.
By the way, the Gramm is very well named after a dead scientist: Saxo
Grammaticus, living in the middle ages around 1100, famous Danish
historian, who wrote a history of Denmark in 16 volumes. He even
attempted to write an English grammar - English and Danish were not so
far apart in those days -, but failed because it would have become too
heavy for the reason of the many exceptions to its rules (at the time,
there were such). Therefore, the unit of weight was named after him.
My best regards!
Peter Blodow
Dipl.-Phys.
Am 24.02.2019 um 10:31 schrieb andy pugh:
The hecto, centi, deci, deka are deprecated in SI, so cm should not be
used.
I am a bit annoyed that the base mass unit is the kg, ie that it has an
embedded prefix. That is one unit that could very usefully be named after a
dead scientist.
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