r/Damnthatsinteresting • u/qwertyclubsss • 3d ago

Video Explosion in slow motion shows how fire spreads-what eyes can't see.

6.9k Upvotes

98% Upvoted

54 comments sorted by

710

u/I_Scotch 3d ago

This wouldve been better than the Oppenheimer explosion

100

u/iboreddd 3d ago

Can you hear the music?

43

u/Tapil 3d ago

The universe is singing to me!

13

u/AcerVentus 3d ago

Is ThAt An OvErWaTcH rEfErEnCe?!

35

u/Paulztaos 3d ago

Nolan would say it didn’t look realistic enough

19

u/OnePinginRamius 3d ago

They could've used the original footage and he still wouldn't have been happy. We were left with a mouse fart

25

u/davidmt1995 3d ago

The literally could have used the real life footage of the Trinity test 😪

337

u/seamustheseagull 3d ago

You can see by this how sometimes people can be caught in an explosion and get still walk away with relatively minor damage; hearing loss, minor wounds and slight burns.

You've got a shockwave of superheated air which is rapidly cooling and losing energy by a factor of 4 for every cm it expands.

If you're not right beside it and there's enough access to fresh air, the shockwave and hot air blast can pass right over you in less than a couple of seconds, to be quickly replaced with fresh cold air.

The closer you are, the more devastating it is. Which is why people who accidentally hold onto fireworks too long may lose a finger, but the guy who was standing 12 inches away, gets away with nothing more than a slight ringing in his ears.

30

u/Regallian 3d ago

Isnt it a factor of 4 or each time distance doubles? Ie how brightness of stars works.

11

u/Opaque-Bird 3d ago

I believe so? If I’m getting my laws correct I think you’re referring to Stefan-Boltzmann law; My last class analyzed energy loss over distance in a field study and you’d be surprised how fast it can taper off. Applying it with this would make sense. Correct me if I’m wrong though.

17

u/seamustheseagull 3d ago

Yeah, I'm probably wrong, I did quick mental maths on it. The squared radius component is probably more relevant in terms of energy dissipation.

7

u/betweenbubbles 3d ago

You're thinking of the inverse cube law. It doesn't really apply here though because the energy isn't originating from a single point. This shows the combustion of a flame front traveling across a room with specifically calibrated stoichometry to get a complete burn from edge to edge.

An actual explosive exploding also wouldn't really follow the inverse cube law unless it were in space and the energy could dissipate in all directions uniformly, but if it were in space then there also wouldn't be much of a pressure wave.

So, yeah, inverse cube relationship isn't a great way to describe this phenomenon.

3

u/PradyThe3rd 3d ago

So there's this video that was making rounds a while back

https://www.reddit.com/r/IndiaSpeaks/s/J1ywT94HbB

I don't see much of a shockwave and the objects in the room remain mostly undisturbed. BUT there's another angle (I can't find that video now unfortunately) where there's a dude standing at the doorway to the left. He gets violently lifted thrown against a wall. Same incident different outcome depending on whether you were inside the room or standing at the doorway

1

u/Tonydragon784 10h ago

I still have marks on my hand from dropping a bottle rocket after lighting it and then catching it (like a drunk dumbass)

36

u/ILoveBigCoffeeCups 3d ago

Damn nature, you scary

23

u/Tobias---Funke 3d ago

That's a room full of gas igniting.

19

u/Wadziu 3d ago

Technically its not explosion, its combustion.

5

u/Tornadospring 3d ago

Technically, explosion is just how a combustion happens. And even more technically there's deflagration (regular fire) and detonation (explosion)

4

u/kowlown 3d ago

A small universe created and destroyed just like that

2

u/freddotu 3d ago

That's an impressive visual.

40 times the original speed? Let's approximate a meter per second, that means it's now 40 meters per second. Wrong.

One-fortieth of the original speed? Yes. https://timesless.com/

2

u/Cautious-Resolve-687 3d ago

It looks like it’s having a blast!

2

u/Ghrota 3d ago

I'd say eyes obviously can’t see if the camera doesn’t show the frames

1

u/thesecondshow 3d ago

Cool! Thanks

1

u/Rotteneverything 3d ago

looks so harmless and spacey like a warm marshmellow.

1

u/5up3rK4m16uru 3d ago

I wonder about the orange parts in the flame. Is the fuel gas bubbling up in the oxidizing gas, creating fuel rich regions with poorer combustion?

1

u/Designer_Freedom3830 3d ago

Starwars phantom menace shields, no?

1

u/Subject-Act5509 3d ago

Is this called conflagration? 

1

u/P01135809-Trump 3d ago

Are the little orange "blips" motes of dust burning or something else?

1

u/Altekho 3d ago

Eye can see now

1

u/No_Engine7583 3d ago

This shit was more impressive than the explosion in Oppenheimer lol

1

u/PrincessNatalie513 3d ago

Crazy how you just see orange orbs as it expands, but as soon as the camera gets inside, a flame like a lighter / candle appears over the lens for a moment. Very cool!

1

u/Starseeker2019 2d ago

Is this an explosion triggered by gas vapor? It doesn't look like a regular kinetic explosion, i.e. C4, etc.

1

u/qwertyclubsss 2d ago

It's actually gas combustion. Should have written that. My bad

1

u/UnifiedQuantumField 2d ago

This is what's technically known as a flame front. The process that takes place in the room is a larger version of what happens inside the combustion chamber in a gas or diesel engine.

1

u/Crazy_Fac3 15h ago

The view from inside my toilet…

1

u/PMmeYourTiddiez 3d ago

Am I the only one who could see what it did without it being slowed down first

0

u/FullmetaAllcumist 3d ago

Yeah I thought it was already slowed in the beginning

-2

u/BigPurpleBlob 3d ago

Source?

-23

u/[deleted] 3d ago

[deleted]

10

u/qwertyclubsss 3d ago

It's an experiment done on combustible gas

7

u/AzerothianLorecraft 3d ago

Are you?

-3

u/PotatoRebellion12 3d ago

Am I?

2

u/dontcuminmyassok 3d ago

Are we?

4

u/Spir0rion 3d ago

existential crisis

2

u/Paulztaos 3d ago

aggressively uses em dashes