this post was submitted on 21 May 2025
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realistically, nobody uses all the units.
eg, decimeters are practically unheard of.
anyway, start measuring things around you. like your fingers, your hand, your ceiling height, that sort of thing. and then remember what those measurements feel/look like. that'll give you something to compare other things to. you can do the same thing with volume measurements and so on.
for example, i found that one of the knuckles on one of my fingers is exactly 4cm long, so i always have that with me.
I use micrometers µm when I buy a water filter (mechanical), µm 1 micrometer traps debris more than µm 5 micrometers and bacteria, as well as some large viruses.
There is so much potential for unused unit systems. Imagine if gigameters where used instead of light years!