Anonymous at Thu, 10 Oct 2024 13:29:06 UTC No. 16419111

>>16419108
Pound force and fluid ounce. Anglos are deranged people.

Anonymous at Thu, 10 Oct 2024 13:38:34 UTC No. 16419129

mmH2O as pressure unit.
Why.

Anonymous at Thu, 10 Oct 2024 13:49:06 UTC No. 16419149

Slugs

Anonymous at Thu, 10 Oct 2024 13:50:16 UTC No. 16419152

centiPoise or some shit

Anonymous at Thu, 10 Oct 2024 13:52:11 UTC No. 16419155

>>16419108
>Degrees kelvin
Kek what a retarded bitch

Anonymous at Thu, 10 Oct 2024 13:54:18 UTC No. 16419159

>>16419155
> radian degrees rankine

woooosh

Anonymous at Thu, 10 Oct 2024 13:57:47 UTC No. 16419162

>>16419159
I understand the joke. The problem is that the unit is Kelvin, not degrees Kelvin. Hence the "joke" was written by a retard.

Anonymous at Thu, 10 Oct 2024 14:13:03 UTC No. 16419184

>>16419162
You're not helping your case.

Check the formula of Kelvin to degrees Rankine.
Check the formula of degrees to radian.

Combine, 1 degree (angle) * 1 Kelvin = ...?

Anonymous at Thu, 10 Oct 2024 14:15:06 UTC No. 16419187

>>16419108
the pound foot is one of them

Anonymous at Thu, 10 Oct 2024 17:29:28 UTC No. 16419462

>>16419111
>Pound force
the real werid one is pound mass, which feels like a quick fix to cover your ass for confusing force and mass at the outset

the only really weird units i've seen are things like ft * mgal / (m^2 * fortnight) that you see in engineering tables for shit like designing sewage flow rates in rectangular pipes

Anonymous at Thu, 10 Oct 2024 17:32:42 UTC No. 16419466

>>16419129
Because it's more plentiful than mercury

Anonymous at Thu, 10 Oct 2024 17:34:53 UTC No. 16419467

>>16419108
Personally I like to use as hoc measurements like cubits and hands and then convert them to real measurements later. Works best for measuring length.

Anonymous at Thu, 10 Oct 2024 17:35:06 UTC No. 16419469

>>16419108
https://www.youtube.com/watch?v=kkfIXUjkYqE

Anonymous at Fri, 11 Oct 2024 20:38:03 UTC No. 16421669

I personally like to work with natural units. Absolutely fucks with experimentalists lol

Anonymous at Fri, 11 Oct 2024 20:47:16 UTC No. 16421698

>>16421669
and it absolutely fucks with theorists too, because all those physical constant coefficients encode the relationship between different physical dimensions.
by setting all those constants to 1 and suppressing the multipliers, you are forgoing valuable dimensional analysis information in your equations.
it's like how every one sucks dynamically typed languages' dicks until they realize type information is actually hugely beneficial in reasoning about code.
people like you cause more problems than they are worth.

Anonymous at Sat, 12 Oct 2024 12:22:27 UTC No. 16422654

>>16419108
Electronovolts. As units of distance, mass, temperature, time and some other shit.

Anonymous at Sat, 12 Oct 2024 13:22:43 UTC No. 16422712

>>16419108
Common nails are identified using the pennyweight system. For example a 16-penny nail (abbreviated 16d--the d stands for denarius) is 3 1/2 inches and 100 of them would have cost 16 pence. There were 240 pence to the pound of silver. Before the 20th century when (((something))) happened to currency standards the value of precious metals was so stable that the pennyweight system became culturally ingrained over the centuries and is never going away.

Anonymous at Sat, 12 Oct 2024 13:26:28 UTC No. 16422714

>>16422654
It’s a unit of energy. Natural units really are the great IQ filter kek.

Anonymous at Sat, 12 Oct 2024 16:07:18 UTC No. 16422947

>>16422714
If you're unfamiliar with particle physics why and how would you understand that, if you see them used as units for everything

Anonymous at Sat, 12 Oct 2024 16:20:06 UTC No. 16422968

What's the unit for Reynold's number? You know the on that determines laminar flow from turbulent flow.

Well I'm glad you asked! The unit of Reynold's number is of course my peenus weenus! Haha, what is the unit of Reynold's number? My answer of course is - my peenus weenus! Haha. It's my peenus weenus!

Anonymous at Sat, 12 Oct 2024 17:58:15 UTC No. 16423205

>>16422947
It doesn't really take anything more than understanding what a constant is and why it exists, which everyone learns in highschool.

They don't even have to know what different ones are. It takes two seconds to explain "so this one sets the magnitude of electric force" and so on.

B00T at Sat, 12 Oct 2024 18:00:01 UTC No. 16423213

>>16423205
Fag

Anonymous at Sat, 12 Oct 2024 18:00:26 UTC No. 16423214

>>16423205
while it is true that the key is understanding how the constant is used to related units, the choice of units often reflects an experimental history that you are sweeping under the rug as unimportant

B00T at Sat, 12 Oct 2024 18:01:27 UTC No. 16423217

>>16423213
nta, but namefags are the worst kinds of fags, only surmounted by tripfags

B00T at Sat, 12 Oct 2024 18:02:54 UTC No. 16423221

>>16423217
Fag here, I'm a fag

Anonymous at Sat, 12 Oct 2024 18:19:09 UTC No. 16423249

>>16421698
You don't. You sound like someone who has never worked with them. Setting [math]\hbar = c = \epsilon_0 = k_B = 1[/math] means that all your units are of integer dimension. You can easily check if you made a mistake while doing algebra without having to go through ten thousand unit definitions in your head. Skill issue.
>>16422947
>why and how would you understand that
It's a unit of energy equal elementary charge times 1 volt. That's all there is to it. More convenient for small things than joules.

Anonymous at Sat, 12 Oct 2024 18:31:07 UTC No. 16423271

>>16423249
>It's a unit of energy equal elementary charge times 1 volt. That's all there is to it. More convenient for small things than joules.
What I asked was how you would understand that/why a unit of energy is being used to measure things that are conventionally not measured with by a unit of energy, not what is a unit of energy.

>>16423205
No it doesn't, you need to understand that there are implied constants used to convert to mundane units when you use eV to measure e.g. mass, and even then it will really only make sense when you also understand the relationships that gives you those factors of h bar or (in that case) c. So why would even a very intelligent person who is uninterested in particle physics not be very reasonably confused by the use of eV to measure the mass or lifetime of a particle?

Anonymous at Sat, 12 Oct 2024 18:31:40 UTC No. 16423273

>>16421698
>you are forgoing valuable dimensional analysis
On the contrary, setting h=c=1 or going even further than that can greatly efficientize calculations without loss of knowledge, and can often reveal truths that were previously obfuscated behind heavy derivations.

Anonymous at Sat, 12 Oct 2024 18:33:41 UTC No. 16423277

>>16423273
>efficientize
saaar do the needful and efficientize you bloody benchod

Anonymous at Sat, 12 Oct 2024 18:39:03 UTC No. 16423285

the SI Time Unit called "second".
it's turbo retarded. look it up. they are trying to ruin science.

Anonymous at Sat, 12 Oct 2024 18:41:10 UTC No. 16423290

>>16423277
I said that because "optimize" and "increase the efficiency of" sounded off to me. Plus, I found it funny.

The English language is one in which parts of words carry their own meanings, and these can be arranged in different ways to create meaning. You knew exactly what I meant when I said that, so what's the issue?

Anonymous at Sat, 12 Oct 2024 19:15:28 UTC No. 16423361

>>16423273
keeping track of some multiplicative factors isn't hard, dumbass.
you are just wanking off to how few symbols you can use to write down some mathematical relationship.

Anonymous at Sat, 12 Oct 2024 19:43:08 UTC No. 16423423

>>16423361
Yes, it’s not. Keeping track of whether your answer is in m^3 C^-1 s^-3 kg^2 is. This is just dimension 2 in natural units. You can always go back to metric because the conversion is one-to-one.

Anonymous at Sat, 12 Oct 2024 20:01:29 UTC No. 16423463

>>16423423
dimensional analysis is your friend. it's like statically typed programming languages. it's really easy to detect when you've fucked up if you try to add unlike units. if all your units are 1, then it's a lot easier to make mistakes and not detect them.
moreover, for theory to be of any use, it needs to be mapped to things people use in the lab. sweeping all the units under the rug is just theorists sniffing their own farts.

Anonymous at Sat, 12 Oct 2024 20:30:04 UTC No. 16423515

>>16423463
Yes. It is my friend indeed. It is incredibly easy to see where I fucked up when everything is powers of a single dimension. Unlike the alternative where I have to juggle powers of 10 units while converting them.

I don’t think you get the point, anon. Using natural units means that length is dimension -1, area is dimension -2, momentum is dimension 1, torque is dimension 1 and so on. Where do I lose any information during algebraic manipulations with these?

Anonymous at Sat, 12 Oct 2024 23:19:19 UTC No. 16423739

>>16423361
Like I said, it can also reveal truths to you that are obfuscated otherwise.

For example, if you take your unit of length to be one light-second, E=mc^2 becomes E=m, turning from "energy is mass times a speed" to "energy IS mass". A normie would not be able to figure out how the first equation implies mass/energy equivalency, but they could surely tell from the second.

Now, I know you're thinking "but I could already tell that from the original!". Of course you, a learned person, could, its only one step of deduction away. However, in most cases it will not be anywhere near this simple, and you will not be able to uncover the implications of the math in front of you without a tool like this.

Anonymous at Sat, 12 Oct 2024 23:34:06 UTC No. 16423755

>>16423739
This is a very brainlet take. Photons have energy yet no mass. The main reason to introduce c=1 is so that the four-velocity vector is a unit tangent vector along the worldline. This way we can speak of motion as just static differential geometry. Compare with Galilean mechanics where time is an arbitrary thing defining a parametric curve.

Anonymous at Sun, 13 Oct 2024 00:21:43 UTC No. 16423819

>>16423755
I guess I should have phrased it as "mass is energy" suggesting that energy is an umbrella term that mass falls under. At the moment, I figured it was best to keep the order of the equation to demonstrate my overall point.

Anonymous at Sun, 13 Oct 2024 00:29:33 UTC No. 16423824

>>16423819
The equation isn’t even the full one. The full one is E^2 - p^2 = m^2. You can clearly see with this one that photon’s energy is its momentum. And it’s just the inner product of a four-momentum vector. In some sense, rest mass is the fourier transform of proper time.

Anonymous at Sun, 13 Oct 2024 00:54:53 UTC No. 16423850

>>16419108
kilowatt-hours per year
energy per time times time per time. great.

Anonymous at Sun, 13 Oct 2024 01:29:20 UTC No. 16423907

Give me ONE good reason why we need anything more than
kg, meter, second.

>le electrical charge!

Anonymous at Sun, 13 Oct 2024 01:40:15 UTC No. 16423921

>>16423850
You don't care about how much energy you used in a year and therefor your carbon footprint?Talk about privilege.

Anonymous at Sun, 13 Oct 2024 13:13:02 UTC No. 16426850

>>16423271
Theorists set physical constants to 1 because they are totally unimportant for the problems we are solving.
For example consider the Ising model on a 2D lattice, you have N spin variables S_1,...,S_N and each one is +/-1. The energy of the system is:
E(S) = -J sum_{<i , j>} S_i S_j
where the sum is over neighboring sites on the 2D lattice. J has units of energy. Now the problem is to determine the partition function,
Z = sum_{S1,...,S_N} exp(- beta E(S))
where the sum is over 2^N spin configurations. This comes from statistical mechanics where the beta = 1/(k_B T) , has units of inverse energy.
I wrote the Boltzmann constant k_B for you. Most discussions of such a high-level problem will just set this constant = 1. It is focused on a mathematical counting problem over this exponentially large space, it is a waste of writing and visual space to talk about k_B. You are imagining that physics is like some school homework problem with alebra, but the algebra and constants are just clean up. It's as if we are building a giant battleship and you are on our ass about the pieces not being painted before assembly. We'll paint the fucking thing before we send it out, that is the least of our concerns.

Anonymous at Sun, 13 Oct 2024 13:20:18 UTC No. 16426978

>>16426850
Are you fucking illiterate? I'm not asking you to explain to me what natural units are I'm perfectly aware. The OP question is "what are some weird units" and, to someone who has not had reason to encounter them before, natural units are weird units.

I know all the way up there on the peak of the bell curve it might be hard to imagine this, but try to think how you would feel if you hadn't had breakfast this morning, or seen natural units before.

Anonymous at Sun, 13 Oct 2024 13:31:50 UTC No. 16427250

>>16423271
>What I asked was how you would understand that/why a unit of energy is being used to measure things
You can ask the exact same question with a joule or a calories. I don't get why an electronvolt is any different for you.

Anonymous at Sun, 13 Oct 2024 13:34:17 UTC No. 16427326

>>16427250
If you measured mass using calories it would also look strange to many people. It is conventional that energy and mass get different units, in everyday situations.

Anonymous at Sun, 13 Oct 2024 13:35:18 UTC No. 16427349

>>16427326
>energy and mass
And any other quantites that have distinct SI units, and some that do not.

Anonymous at Sun, 13 Oct 2024 13:38:13 UTC No. 16427421

>>16427326
??? Nobody measures mass using electronvolts. The unit of mass in nuclear and particle physics is eV/c^2.

Anonymous at Sun, 13 Oct 2024 16:24:40 UTC No. 16428555

>>16427421
And in natural units [math]\c=1[/math].

Anonymous at Sun, 13 Oct 2024 16:30:22 UTC No. 16428595

>>16428555
So? What's the issue here?

Anonymous at Sun, 13 Oct 2024 19:39:56 UTC No. 16429240

>>16419108
Inches, feet, yards, miles, Fahrenheit, pounds & stone. I can't believe people use all that bullshit

Anonymous at Sun, 13 Oct 2024 20:02:27 UTC No. 16429281

>>16419108
Anything related to thermodynamics. The entire idea of using separate units to describe thermal behaviors might have made sense 2000 years ago when we didn't know what the fuck was going on, but at this point distinguishing between different units for microscopic versus macroscopic behavior is just dumb.

Everything about thermal physics and statistical physics and their connections become so much more elegant when you realize that 90% of the different properties and coefficients and shit just become unitless factors of integration to describe different ways of averaging shit and you don't have random kBs and shit floating around.

Anonymous at Sun, 13 Oct 2024 20:16:32 UTC No. 16429307

Going from cgs to SI gives me anxiety, but it does make you appreciate how electric and magnetic fields should have the same units.

Anonymous at Sun, 13 Oct 2024 20:20:01 UTC No. 16429318

>>16421698
I've heard of computational physicsts having to normalize their equations with coefficients to make them unitless, allowing for more freedom in modelling the system, but I believe anon here is pointing out you are losing a valuable check to your derivations. Like imagine putting a negative sign in the wrong place.

Anonymous at Sun, 13 Oct 2024 21:00:49 UTC No. 16429413

>>16429318
Unitless parameters are one thing - describing fluid dynamics in terms of Reynolds numbers or plasma behavior in terms of Hall parameters is fine because the unit underlying information from the definitions of those coefficients can always be recovered.

But randomly declaring half the constants in your equation "1" sacrifices an obscene amount of dimensional information that becomes difficult to recover after the fact.

Anonymous at Sun, 13 Oct 2024 21:06:03 UTC No. 16429437

>>16429318
>>16429413
fucking retards. Read >>16423515. They aren’t random. The choices made allow you to recover any quantity in question by putting back however many powers of those constants you need.

Anonymous at Sun, 13 Oct 2024 21:14:28 UTC No. 16429463

>>16429281
If you have kilobytes in your thermodynamics eqns you are using the wrong entropy :D

Anonymous at Mon, 14 Oct 2024 00:04:31 UTC No. 16429851

>>16429318
>computational physicsts having to normalize their equations
the reason why you do this is because floating point arithmetic is most accurate around +/- 1.0, which is the only reason i can think of to use normalized units (and it's not a bad reason, but not always required)

Anonymous at Mon, 14 Oct 2024 00:36:38 UTC No. 16429912

>>16419108
Chains.

Anonymous at Mon, 14 Oct 2024 00:42:23 UTC No. 16429916

Buddy, lemme tell you about the oilfield. API gravity, barrels per minute, pounds per thousand gallons, degrees Baumé. There is not a single rational unit of measure in the entire gotdang industry.

Anonymous at Mon, 14 Oct 2024 02:01:48 UTC No. 16430009

moles per acre

Anonymous at Mon, 14 Oct 2024 06:04:41 UTC No. 16430372

>>16422968
what?

Anonymous at Mon, 14 Oct 2024 06:20:25 UTC No. 16430378

>>16419108
Big macs per week

Anonymous at Tue, 15 Oct 2024 10:40:32 UTC No. 16432687

>>16430009
>moles per acre
unit or underground mammalian?

Anonymous at Wed, 16 Oct 2024 00:54:04 UTC No. 16433690

poops/lifetime

Anonymous at Wed, 16 Oct 2024 02:01:58 UTC No. 16433761

Learning kinetics I always thought [math]M^{-1}s^{-1}[/math] was weird because it means [math]\frac{L}{mol*s}[/math], Liters per mole times seconds? But makes sense once you understand the process it describes.

My favorite units are imaginary vibrational frequencies, which also make intuitive sense after a while and are very useful.

Anonymous at Wed, 16 Oct 2024 02:04:18 UTC No. 16433763

>>16433761
also just the unit [math]s^{-1}[/math] is kinda strange at first

Anonymous at Wed, 16 Oct 2024 17:05:07 UTC No. 16434681

>>16433763
usually people omit the unit of whatever is being counted.
i.e. it's posts/s not 1/s when talking about board stats.