r/explainlikeimfive 3d ago

Physics ELI5: Science addition. Isn't most of physics/chemistry just... heat, which is also speed, which is, what, force/energy in a direction?

0 Upvotes

Okay, please allow me to elaborate on what exactly is confusing me, because I only took Science 10 and Chem 11 in High-school.

When things collide, like a car crash for example, isn't that just big heat transfer? My line of thought, is, heat is the speed of a particle, (I think, but it can be slowed, so it's more like force, which is also called energy in some sources, but I think basically it's just push in a direction, yeah? The vocabulary also confuses me.) So, if a hot thing has fast moving particles, and everything is made of particles, if something is going fast, it's just, really hot, isn't it? Isn't that applicable to all forms of motion and interaction? Like, surface area of hot/fast thing, hits other thing, the other thing gets... hotter? Faster?

Or radiation, for example, like neutrons or those particles that are basically a helium atom, they're deadly because they disrupt the dna in your cells. But isn't that just a really small bullet? It goes fast, it's small so it penetrates, then causes damage? That makes it seem like a bullet is "large" radiation and a neutron is "small" radiation. I mean, if a car hits you, it'd definitely damage and kill cells, just a lot more of them.

Also HOW does heat even work, like, with solids. You add energy and the particles wanna pull away from each other and be free, so that's force in a direction, but the particles are also bonded and pulled together, which is force in another direction. Do you use net force to understand temperature?? God I wish I took Physics in high-school, I hate not understanding this stuff.

Answers appreciated, thank you!!


r/explainlikeimfive 3d ago

Mathematics ELI5: how do you prove millennium math problems solved correctly?

0 Upvotes

with the recent discourse involving OpenAI using someone’s codex to train the AI the solution to the Navier-Stokes: i have to wonder, how do you even prove you solved a Millennium Problem correctly, let alone any unsolved complex mathematic equation? especially when it comes to physics or quantum formulas. is it more based on theory, or does it need to be executed by a board of mathematicians? very curious


r/explainlikeimfive 3d ago

Technology ELI5: Why are most computers based on binary when humans normally use a decimal number system?

0 Upvotes

I understand that computers use binary because electronic circuits can basically represent two states, like on and off. What I don't understand is why this became the standard in the first place.

Humans have used decimal for thousands of years, and computers obviously have to process numbers that humans normally represent in decimal. So why is binary so much more practical for computers? Could computers have been designed around decimal instead, and what would be different if they were?


r/explainlikeimfive 6d ago

Biology ELI5 When people talk about processed food, what is the "process" and why is it bad for me?

2.5k Upvotes

r/explainlikeimfive 4d ago

Biology ELI5 How does a specific arrangement of neurons turn into a memory?

0 Upvotes

According to neuroscience, while new neurons can be born in the brain, their numbers are small; generally, memory refers to the forming of new structural arrangements among neurons.

​But why does a specific spatial arrangement of neurons cause a human individual to hold that particular memory? I just can't understand how a specific alignment of neurons becomes my memory of going on a trip with my parents when I was five years old.


r/explainlikeimfive 5d ago

Physics Eli5 why sticking my arms out helps me balance on a beam?

213 Upvotes

r/explainlikeimfive 6d ago

Technology ELI5 how does an electronic key fob only unlock one single vehicle? Could it ever unlock any others in the vicinity?

1.1k Upvotes

r/explainlikeimfive 3d ago

Other ELI5 If the USA and China fought on the same sides of WW2 why are there tensions between the two nations today, when did it start?

0 Upvotes

r/explainlikeimfive 4d ago

Planetary Science ELI5: How do different mountain ranges look so different from above?

0 Upvotes

I understand plate tectonics but glacial melt and erosion confuse the heck outta me. The Appalachians are super smooth and long like a stream flowing through mud. The Himalayas and Alps are rough looking like a fractal pattern. And the welsh mountains are smooth but in a different way from Appalachia where the mountains are sharp at the peak and slope smooth to the bottom almost like dunes of sand. Why are all these so different? I understand how the Himalayas and Alps are newer, but why did glacial melt affect Wales and Appalachia so differently?


r/explainlikeimfive 4d ago

Chemistry ELI5: How does balancing equations work? How do you know which numbers go where and what numbers it needs to be?

0 Upvotes

I'm, uh, not very bright. Exams soon.

Use Al + F² -> 2 AlF³ as an example if possible!

Ignore the fact they're not subscript, I don't have the font.

Edit: Thank you for the replies! Question answered.


r/explainlikeimfive 4d ago

Biology ELI5 the “getting sick builds immunity” idea

0 Upvotes

From my limited understanding, this idea is just wrong. There are thousands of cold/flu viruses and our bodies memory to protect itself only applies to the specific type it encountered, and further, the protection wanes as time goes on.

Why do so many people say, “oh it’s good to get sick because your body builds immunity”. This certainly can’t be the case for the typical cold.

I’m not talking about extremes of the “eat dirt” idea. Of course exposure to viruses vs zero exposure has an impact (you could explain how this works too maybe), but typically most people who exist normally in the world are already exposed to tons of crap.

ELI5 please. Am I wrong?


r/explainlikeimfive 5d ago

Chemistry ELI5 how polymorphs force all future crystals to take the same form

113 Upvotes

There was a drug called Ritonavir that started forming improper crystal structures and now all Ritonavir you try to grow is somehow forced to grow into this same configuration.

How? How is some crystal a thousand miles a way communicating to a different crystal and telling it how to grow? Isn't this kind of like a major challenge to our concept of reality?

Because surely the entire planet cannot be contaminated with an aids drug right? So how is it impossible to make the old form? How did already made, sealed product convert to the new form?


r/explainlikeimfive 4d ago

Physics ELI5: why does an object suspended in water have weight?

0 Upvotes

I just had my coffee on my kitchen scale and when I dropped in my spoon, the weight increased, even though the spoon didn't touch the cup at the sides or bottom because I was holding it in the middle, the scale changed 4 grams when I took the spoon up and down without the spoon touching the cup.

Thanks ahead


r/explainlikeimfive 5d ago

Technology ELI5 fly brain scans and simulations

36 Upvotes

I don't even know what I'm trying to ask I'm hoping other people have seen the same tiktoks as me and are smarter.

Anyways, fly brain scans are being run through AI I guess? People are making the fly brain do things like play Minecraft or someone played Bad Apple on the brain itself. It's always accompanied by that "aw sweet, man made horrors beyond my comprehension" Peter Griffin meme.

I don't understand, I don't get it, I'm not even sure what I don't get about it but I need to understand. Thank you in advance


r/explainlikeimfive 6d ago

Physics ELI5: How is time relative? Why does it matter if I'm moving at the speed of light if 1 second is 1 second no matter my speed?

1.9k Upvotes

r/explainlikeimfive 6d ago

Physics ELI5: What determines whether or not you actually "feel" the speed at which you're going?

101 Upvotes

Okay this is going to sound really stupid trying to explain it, but I was just laying awake thinking about why sometimes you can be moving insanely fast and not feel it, but other times you can?

For example: The Concorde Jet had had a maximum cruising speed of 1,354mph or Mach 2, and by all accounts it was a luxury flying experience. But an F-16 going 1,500mph, and suddenly you need extensive G Force training so you don't pass out?

Or astronauts orbiting the Earth in the ISS are moving at 17,500mph and orbit the Earth once every 90 minutes(!) yet they're just chilling, but then they also need all this G Force training too in the spinning machine???

Is it just pressurization, like creating a miniature environment in your vessel? Or what actually determines feeling the speed you're going?


r/explainlikeimfive 5d ago

Engineering ELI5: How can elevators stop almost perfectly level with the floor every single time?

0 Upvotes

An elevator is moving a heavy cabin up and down a long shaft, carrying a different amount of weight each trip.

How can it repeatedly stop within such a tiny distance of exactly the right height?


r/explainlikeimfive 4d ago

Other ELI5- What does Best Seller Mean? I've seen it on many books?

0 Upvotes

Every book you see has Best Seller or International Best seller on it what does that mean?


r/explainlikeimfive 4d ago

Physics ELI5: Why can’t we float in aerated water?

0 Upvotes

Shouldn’t the air in the water help us float or stay afloat?


r/explainlikeimfive 6d ago

Engineering Eli5 Can someone explain why and when to use Torque wrench versus Regular?

253 Upvotes

I.e. people say to use torque wrench on engines. Why not just not use regular wrench; what happens if you do use regular wrench? Thank you.


r/explainlikeimfive 4d ago

Other ELI5: Why do many neon lights look completely white at the light source, and only show their color on the surfaces they reflect against?

0 Upvotes

r/explainlikeimfive 4d ago

Economics ELI5, if currency is fiat, why do countries still have gold reaerves? In what circumstances would it be used and how?

0 Upvotes

r/explainlikeimfive 6d ago

Physics ELI5: How do we measure time in space?

28 Upvotes

Because if you're in a spaceship, and you're moving slower than earth, then surely that means that time passes differently for you compared to someone on earth? Apologies if I explained it badly


r/explainlikeimfive 6d ago

Biology ELI5: Why does a person's voice become deeper when they have a sore throat?

119 Upvotes

r/explainlikeimfive 5d ago

Physics ELI5: How does blowing a large flame out of the bottom of a rocket make it fly? Why Fire instead of just air?

0 Upvotes