this post was submitted on 15 Sep 2023
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No Stupid Questions

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I've learned about them in school, but I've never heard anyone say something is 8 decameters long or anything like that. I'm an American.

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[–] OptimusPhillip 11 points 1 year ago (2 children)

As an American who has gotten very used to metric units in studying engineering, the general rule I picked up is that you typically only change units every three orders of magnitude. So 8 decameters would typically be expressed as 80 meters, maybe 0.08 kilometers. Decameters and hectometers are a thing, but they're not common units. Even centimeters don't see much use compared to millimeters.

[–] Siegfried 2 points 1 year ago

We usually go for the 3 order rule, but in the case of areas and volumes, for dimensional reasons, dam and hm make it into the three order rule. Dm (or dam) is not common but dam^3 has some uses, the same goes for hm, hm is used for only special situations (like meassuring train distances), but hm^2 is almost globally used for big chunks of land. Also, with hm^2, we always keep the unit, so for example, Parque Nacional Iguazú in Argentina has 67620 hm^2 (also ha or hectarea).

I'm also an engineer and I generally despise imperial units, but I have to say that inchs are pretty handy and the 1 in = 25,4000... mm relation is pretty neat