How come people say 5,000 km and not 5 Mm?
why not just say millions of meters or Mega meters?
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Not much need to use Mm, it doesn’t come up very often. So when it does it’s easier to use thousands of km so as to not confuse people with “another” measurement.
2 points
We routinely count vehicle odometers in thousands of kilometers, AKA Megameters. I’d say it’s a common enough measurement to popularize Megameters
1 point
