this post was submitted on 20 Oct 2023
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Risa

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Star Trek memes and shitposts

Come on'n get your jamaharon on! There are no real rules—just don't break the weather control network.

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[–] MarmaladeMermaid@lemm.ee 32 points 1 year ago* (last edited 1 year ago) (1 children)

Is this a picture taken off a tv screen?

ETA: I’m not complaining, this place needs as much T’pol as it can get and this is a lovely template.

[–] Klear@lemmy.world 30 points 1 year ago (2 children)

Cold wind is slow-moving particles hitting you at high speed.

[–] MarmaladeMermaid@lemm.ee 2 points 1 year ago

I’m sorry, but THE WINDS I FEEL ARE ONLY WINDS OF CHANGE! 🎸🎶❤️

The winds of winter do move slowly...

[–] Masimatutu@lemm.ee 20 points 1 year ago (1 children)

Well akshually......what is measured is the average kinetic energy (mass times speed squared divided by two), so if you multiply by two times the Boltzmann constant divided by the particle's mass and take the square root, yes, you do get the particle speed (assuming all the particles have the same mass and speed, which they don't lol)

nice meme tho

[–] Natanael@slrpnk.net 15 points 1 year ago* (last edited 1 year ago) (2 children)

Actually actually Temperature is expressed as the inverse of the rate of change of entropy with internal energy, which in normal materia in normal states translate to average particles speed, but in extreme cases entropy can start to decrease with increasing energy and vice versa

[–] MrPoopyButthole@lemmy.world 8 points 1 year ago

Yep, entropy is the key word here. Amount of different possible states -> "random" vectors of inertia + particles speed -> higher temperature. If all the particles were going in the same direction -> lack of different states -> low entropy (which can still be high energy, but measured as low temp). AKA what laser cooling does.

[–] Elivey@lemmy.world 3 points 1 year ago

I'm taking cell biophysics right now and your comment is triggering me.

[–] gibmiser@lemmy.world 11 points 1 year ago (1 children)

So speedometers are just thermometers for cars?

[–] Silverseren@kbin.social 10 points 1 year ago* (last edited 1 year ago)

They measure how hot the engine is. The more hot, the more vroom.

[–] xkforce@lemmy.world 11 points 1 year ago* (last edited 1 year ago) (1 children)

The more precisely momentum is known, the less precisely is its position known and vice versa. As for how temperature affects these measurements, the velocity of atoms and molecules isnt a sharp peak but a probability distribution whose maximum shifts toward higher velocities as the average temperature increases.

[–] tias@discuss.tchncs.de 2 points 1 year ago (1 children)

IIUC extremely cold substances turn into so-called Bose-Einstein condensates because their temperature (hence speed) is so tightly controlled that their location becomes more "spread out" in terms of probability. And you can't fix its location without raising the temperature.

[–] xkforce@lemmy.world 5 points 1 year ago (1 children)

Sort of. It has to do with certain matter (they have to be neutral bosons i.e particles with integer spin and no overall charge) being so cold that there arent really any higher energy quantum states for things to be in. So everything is essentially in the same state and functionally indistinguishable. Which is why not everything can form a bose einstein condesate.

[–] Natanael@slrpnk.net 2 points 1 year ago

It is a combination, if the particles' positions don't overlap then you don't have a condensate, but at low enough energy and close proximity these particles will overlap

[–] ummthatguy@lemmy.world 9 points 1 year ago (1 children)
[–] dreadedsemi@lemmy.world 2 points 1 year ago

Never thought of it that way. So when I have a fever, my forehead is running faster than my feet