this post was submitted on 12 Nov 2025
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Science Memes

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[–] ch00f@lemmy.world 23 points 2 months ago* (last edited 2 months ago) (3 children)

-40C = -40F

Also 0lbs does not equal 0kg when there’s no gravity.

[–] FiskFisk33@startrek.website 19 points 2 months ago (2 children)

huh?

Mass doesnt change with gravity

[–] ramenshaman@lemmy.world 15 points 2 months ago* (last edited 2 months ago) (1 children)

Typically, lbs is not mass, it's weight/force.

[–] FiskFisk33@startrek.website 12 points 2 months ago* (last edited 2 months ago) (1 children)

isn't that lbf?

The pund itself is defined as 0.45359237 Kg

[–] ramenshaman@lemmy.world 7 points 2 months ago (1 children)

Lbs can be lbf or lbm, but usually is referring to lbf, which is 0.4536 kg at 1g.

[–] FiskFisk33@startrek.website 8 points 2 months ago

when comparing to kg I will assume the mass unit, since comparing a mass value to a force has no meaning.

[–] KeenFlame@feddit.nu 1 points 2 months ago (1 children)

And temperature doesn't change with pressure

[–] Lemminary@lemmy.world 1 points 2 months ago (1 children)

I'm not sure if you're joking, but it does. PV=nRT

[–] KeenFlame@feddit.nu 1 points 1 month ago

The point is that pressure is the environment and so is gravity

[–] expatriado@lemmy.world 9 points 2 months ago (1 children)

no mass multiplied with gravity still results in no force, 0 Lb = 0 Kg; 0 Lbf = 0 N

[–] ch00f@lemmy.world 6 points 2 months ago

Yes, but 1kg also results in no force, so it's a trivial statement.

[–] Linearity@infosec.pub 7 points 2 months ago (1 children)

Gravity? What does that have to do with mass

[–] SpaceNoodle@lemmy.world 3 points 2 months ago* (last edited 2 months ago) (3 children)

Nothing in this context, but it can have a lot to do with force, for which pounds is the US customary unit.

[–] FiskFisk33@startrek.website 10 points 2 months ago

when compared to a value in Kg, the only logical interpretation is the mass pound. If it were lbf, the si unit conversion would be Newtons.

Having the same name for two different, but easily mixed up units is really annoying haha

[–] madjo@feddit.nl 0 points 2 months ago (1 children)

It's clear from context clues that they don't mean Force. As kilograms are an indicator of mass, not force. It's not our fault that US' imperial system is silly.

[–] SpaceNoodle@lemmy.world 0 points 2 months ago (1 children)

Imperial is a British thing, and the quantities differ significantly from US customary.

[–] madjo@feddit.nl 0 points 2 months ago (1 children)
[–] SpaceNoodle@lemmy.world 0 points 2 months ago* (last edited 2 months ago)

Nope. As I said, the US customarily uses US customary units. They ARE NOT identical to "Imperial" units, despite the coincidental naming.