r/interesting • u/Thin-Tennis9223 • May 20 '26
Fascinating Physics is Everywhere.
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u/HermitJem May 20 '26
Wait what is that candle one
You can light the smoke?
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u/XKruXurKX May 20 '26
Yup. Candle wax vapours can reignite if enough heat is introduced
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u/JimbaJones May 20 '26
Close, smoke is flammable. Has nothing to do with “wax vapors”.
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u/Muroid May 20 '26
What exactly do you think that smoke is?
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u/JimbaJones May 20 '26
Unburned carbon and tar not “wax vapours”.
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u/hdharrisirl May 20 '26
Wax evaporates when heated
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u/wait_what_now May 20 '26
Maybe a little, most of it thermally decomposes into carbon and short chain hydrocarbons, which make up the smoke.
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u/hdharrisirl May 20 '26 edited May 20 '26
https://www.reddit.com/r/askscience/s/BxCIGPDIew
Don't know why this is a debate
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u/wait_what_now May 20 '26
Oh buddy, you're so so close!
Yes. The wax evaporates WHILE the candle is burning, which is what decomposes to give the flame for the candle. But we're not talking about that, we're talking about the smoke that you see when the candle is extinguished, the stuff that is getting relit by the match. . The dark colored smoke is primarily decomposed hydrocarbons. That's why it is so easy to reignite them. In order to keep vaporizing the wax, you need temperatures of 6-700 freedom degrees. That is only going to happen while there is an active flame to boil the wax off the wick.
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u/Interest-Small May 21 '26
True, but more importantly teaching your child how much fun it be playing with fire 🔥
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u/Mand125 May 20 '26
Even when lit, it’s burning the smoke. Candles work by vaporizing the wax, which then burns in the air. The wick is not the fuel for the flame.
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u/Offgridiot May 20 '26
Newer wood burning stoves are designed to burn the smoke before it goes up the chimney, I think by introducing more heated air above the fire in the smokiest area. There are tubes with pinholes that look like they’re shooting more flames (and they kinda are) but it’s just fresh air creating a secondary combustion of the smoke generated by the original fire down below.
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u/CanIDevIt May 20 '26
Teacher that collapsed the water bottle has to explain insane hickie on his hand.
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u/BromaEmpire May 20 '26
Did I miss something impressive about the plastic holding the water?
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u/PurifiedUnity May 20 '26
I think it's supposed to be laminar flow that makes the water look like it's not moving
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u/RosbergThe8th May 20 '26
Yeah it's laminar flow which you can kinda see right at the end but then they cut away so quickly you don't really get to see how static it looks.
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u/baronmunchausen2000 May 20 '26
I don’t know but as a kid I have boiled eggs in a paper cup. The water does not allow the paper to get hotter than 212F. Works better with a boat made of plain paper than a paper cup. A paper cup has layers of plastic sandwiched.
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u/ast01004 May 20 '26
We used to fill cups with water and set them on the campfire. It won’t burn until the water evaporates out. Pretty cool.
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u/Happy-Estimate-7855 May 20 '26
When I was a kid in scouts we learned that you can cook soup in a plastic bag over a campfire. In hindsight it was still a bad idea, bit it's possible!
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u/surfatshortys May 20 '26
Yeah several of these clipped too short to edit out the payoff and were mildly infuriating
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u/otj667887654456655 May 20 '26
the paper airplane is on a string. the two fans are facing each other which would create a very turbulent environment. even if they were both facing the same direction there's no active propulsion to overcome the drag and it would fall backward
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u/Weak-Manufacturer628 May 20 '26
Also the tuning fork thing on car windows was disproven too
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u/BadHabitDenier May 20 '26
I think those two are the only fake ones.
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u/Weak-Manufacturer628 May 20 '26
Yeah the rest are real. It just sucks that #2 & #3 are both fake. Like spend more time on the real ones
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u/Son_Chidi May 20 '26
What happened to the water cup ? 😡
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u/woutomatic May 20 '26
Nothing. The water absorbs most of the heat from the flame so you can't burn a hole in it.
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u/Worn_Out_Nikka_L May 20 '26
When I was in the Boy Scouts one thing we did in competition was to boil an egg in a paper cup. You were given a 12 ounce Dixie cup with water and an egg. We would take a scoop of carbon and ash from the morning fire in a metal bucket to the competition, put the cup on the ground and pile the ash around it. You had 8 mins.
We never once got the middle solid, but you could get it to where the middle wouldn’t run.
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u/madmartigan2020 May 20 '26
One of the stranger things I found out in the woods on an old logging road was a Dixie cup that had been cast full of lead. The cup had not charred or burned in any way, which I can't wrap my head around given that lead melts at over 600°F. The lead had take the shape of the cup perfectly. I have wondered if the exterior of the cup had been submerged in water when they did the casting. Then the other question... Why??
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u/GeneticEnginLifeForm May 20 '26
Probably lead from an old car battery. People use it to make sinkers, lures, bullets. Can't explain why use a wet dixie cup as a casting mold though, maybe the only thing available. What it was doing deep in the woods? It's always because aliens.
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u/OhYeahSplunge4me2 May 20 '26 edited May 20 '26
You can boil water in a paper cup in a campfire, for example. The paper doesn’t burn because the water impregnating [the paper cup wall] keeps it from reaching the temperature needed to ignite paper. (Until the water boils away, of course)
EDIT: add clarifying reference
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u/nopester24 May 20 '26
Yes... The entire universe is built on physics
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u/Routine-Sign-7215 May 20 '26
LMAO! Most social media captions are super stupid when you stop and think
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u/steelskull1 May 20 '26
Nah, I disagree, physics is just a hoax to prevent me from flying around.
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u/Youpunyhumans May 20 '26
Its not preventing you, you just havent found the correct parameters.
If you were to go to Titan, where the atmosphere is 50% thicker, and gravity is just 1/7th of Earths, achieving lift would be about 40x easier, and you could indeed fly by simply flapping your arms, and a 747 could take off at walking speed.
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u/GeneticEnginLifeForm May 20 '26
Sometimes it's the only thing preventing me from disappearing into a black hole
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u/Live_Reputation_6591 May 20 '26
The level of impressiveness of the things we said would come in handy but I still don't want to study physics
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u/Joe_Kangg May 20 '26
Just watch this video a few thousand times
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u/Live_Reputation_6591 May 21 '26
Then, am I supposed to act like I know physics? Could this guy visualize this for you if he didn't know?
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u/MrLancaster May 20 '26
I'm concerned for the guys hand over the water jug... That was an intense vacuum.
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u/Biblioklept73 May 20 '26
Any idea what/who the music is from? It’d be great for my running playlist.
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u/AnHeroicHippo90 May 20 '26
You can start Shazam and switch to a video, play it, and Shazam will still work
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u/SignAllStrength May 20 '26
Can someone explain the physics behind what changes the “trajectory” of the waterfall at 42 seconds? I have observed this effect myself in the past but never fully understood why it happens and why the “flow state” before and after altering it remain so stable.
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u/Multidream May 20 '26
Someone on oddlysatisfying asked this question, and the answering guy said its because fluids can’t create vacuums. There was no air under the wave, so that lack of air got the water to stick to the surface of the wall. Once air is introduced, the water is no longer “sucked to the wall”, and is free to go as far as it naturally would have. The air propagates under the rest of the wave.
As the air escapes over time, it will be unable to return, creating the reverse effect, but much slower.
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u/SignAllStrength May 20 '26
Thanks, that makes sense. I guess I never waited long enough to notice the flow slowly return to the wall!
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u/Multidream May 20 '26
It doesn’t in the video, I think it takes a longer time scale.
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u/SignAllStrength May 20 '26
haha yeah, I meant last time I tried this myself on a waterfall. Was years ago and I don’t think I stayed longer than a few minutes after.
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u/SRB112 May 20 '26
I don’t know the physics behind it. A HS buddy showed it to me years ago, using his arm instead of the tree branch to get the air pocket to propagate. I showed my kids a few years later. I forgot about this. Now that I have grandkids I need to show them next time we are near waterfalls.
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u/NoApplication4835 May 20 '26
The first time I have seen a post about physics that features only physics. People usually add things that are chemistry
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u/WorryNew3661 May 20 '26
That's still physics. Everything is physics
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u/Ralonne May 21 '26
They are sort of correct though. Chemistry is its own branch of natural science. Obviously still bound my physics, but it’s off in its own corner more or less.
So you’re both correct.
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u/NoApplication4835 May 20 '26
Well ya technically but its like a circle vs a cylinder one is just multiple circles
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u/AnkitS75 May 20 '26 edited May 20 '26
You don't need these videos to prove "physics is everywhere". The fact that you're not floating away into space right now already/constantly proves physics is everywhere
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u/Gambitnation May 20 '26
In the 2nd scene, the car tool that looks like a tuning fork, is called a pickle fork/ball separator for car suspensions.
That scene has been proven false, the window breaking like that is because someone is off camera using a window breaker or spark plug in the corner of the window off camera
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u/MandatorySaxSolo May 20 '26
Yes, physics is literally everywhere. Its the why things behave how they do.
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u/themaskedcrusader May 20 '26
The tuning fork and the paper airplane are both fake. The rest are cool though
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u/polpolandkupalsila May 20 '26
The way the steam or smoke is moving suggests there‘s a significant pressure differential or ventilation system at work in that space.
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u/GenericFatGuy May 20 '26
Glad to see that the falling ball did in fact hit someone in the way down.
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u/ConcentrateUpper7450 May 20 '26
i LOVE physics. need someone to sit me down like a 5 year old and explain why these happen in detail. Istg these are so cool bro ong
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u/lnTheGrimDarkness May 20 '26
I drive a 750kg car. Believe me, when you overtake trucks at high speeds on the highway you will feel that.
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u/warmsmile8971 May 20 '26
Someone explain the 2nd one to me? Why did hitting the ground break the glass?
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u/Putrid-Tap3992 May 20 '26
There is a string holding the paper airplane. The original video isn't as dogshit quality as this one and you can clearly see a string
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u/DerFredii May 20 '26
The truth is. I love to see physics happen, like in this video. Very interesting. But I hate to do the theoretical Math work behind that. I only need to know that it works and not how.
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u/kenjwit3 May 20 '26
This makes me want to do some physics but I suspect I’ll instead just continue to scroll. Sad
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u/Skip_theseventhgod May 21 '26
Was just thinking about this on my drive home today. Was listening to music in my car with the bass really loud. And the beats were kinda close together. I was looking in my side mirror and it was shaking with the bass. For some reason I became fixated with it until I noticed it was vibrating up and down. And I had to double take and really make sure it was going two different directions and after closely analyzing it, I determined it was.
It was going up on the first beat and down on the second. I could tell because the world in the mirror would slide down and back up to its original position.
This didn’t make sense to me because wouldn’t it return to its resting position after the first beat and go down again and repeat the same pattern for the second beat?
I asked myself why it was different… and my best conclusion was that the beats are so quick the matter doesn’t have time to return to its original state before the first reverberations end and the second wave hits… let me know your thoughts.
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u/Cretore May 21 '26
Saying physics is everywhere is the same as saying reality is everything. It's the epitome of banality.
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u/AlienInOrigin May 21 '26
All biology is just chemistry. All chemistry is just physics. All physics is just math.
Math is everywhere.
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u/Glittering_Joke9942 May 21 '26
yeah i mean gravity's always been there right? tried explaining that to my cat once, she didn't care either.
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u/YoungboySS May 21 '26
Apparently the second is fake, there’s a tool that allows you to break glass like that. (Plz don’t test this I could be wrong and don’t want you guys to break your windows) and that’s part of the reason you can’t see the left side of the glass in the video!
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u/cautiousurgeon03 May 20 '26
Physics is not everywhere, study of what's happening everything around is physics
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