this post was submitted on 08 Mar 2024
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Showerthoughts

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A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The most popular seem to be lighthearted, clever little truths, hidden in daily life.

Here are some examples to inspire your own showerthoughts: 1

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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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[–] [email protected] 78 points 11 months ago (5 children)

Familiarity I guess. Mega isn't really a widely used prefix outside of computers. We even say tons instead of megagrams.

[–] [email protected] 62 points 11 months ago (2 children)
[–] [email protected] 35 points 11 months ago (3 children)

But only in regards of nuclear bombs. Maybe it's because of the scientific origins of these fields. Probably the same reasons why Americans measure firearm munition in mm.

[–] [email protected] 6 points 11 months ago

But only in regards of nuclear bombs.

And your mom (⁠⌐⁠■⁠-⁠■⁠)

[–] [email protected] 2 points 11 months ago

we do list volcanic eruptions in megatons of TNT. The makers of the first a bomb pick it since the largest explosion ever made by then was a ship full explosives and some had calculated how many tons of TNT that ship was carrying

[–] anguo 14 points 11 months ago

Instead of teragrams.

[–] [email protected] 31 points 11 months ago (1 children)

megaton, megawatt, megapascal, megacandela (for military flares), megahertz, megajoule, megaohm, megabequerel

[–] [email protected] 31 points 11 months ago (2 children)
[–] [email protected] 17 points 11 months ago (1 children)
[–] [email protected] 3 points 11 months ago

That's bad comedy

[–] [email protected] 6 points 11 months ago (1 children)
[–] [email protected] 3 points 11 months ago
[–] [email protected] 5 points 11 months ago (1 children)

To be fair, mass is weird because the base unit is kg (yes, the name includes a prefactor). I have no idea how they managed to fuck it up that badly.

[–] someguy3 1 points 11 months ago

Apparently they were going to use gram for what we now call kg, but decided to make it kg. I expect it's because we used grams so much for food.

[–] [email protected] 2 points 11 months ago (1 children)

Yes, I think it's a question of use. I can't think of many examples where you would quickly need to know the measurement to the nearest Mm. Maybe if for some reason you deal with a lot of lunar orbits? Diameters of exoplanets?

Any earth distances we need to know with greater precision, and any stellar distances are probably better measured in light years, etc.

[–] [email protected] 3 points 11 months ago (1 children)
[–] [email protected] 1 points 11 months ago

"I've driven 112.326 megameters" takes the same amount of time to say as 112,326 kilometers. 🤷‍♂️