6 ms·

> The glass damage must be horrible. Your entire home covered in tiny pieces of glass. Watch this video at .25x to really see how glass reacts in the pressure

> The glass damage must be horrible. Your entire home covered in tiny pieces of glass. Watch this video at .25x to really see how glass reacts in the pressure wave. You can see the look on the bride's face as the initial vibrations/sound reaches her. Then, you can actually see the window pane bow like a wind sail. https://youtu.be/PUQ-QvCqDjA https://youtu.be/PUQ-QvCqDjA

odysseus 6y ago
Oh no. I really hope the bride and groom are OK!
- stan_rogers 6y ago
  They're fine. And she's an MD who spent the better part of the rest of that day doing what she could for the people around her. https://www.cbc.ca/radio/asithappens/as-it-happens-friday-edition-1.5678021/beirut-bride-seen-in-viral-video-says-she-thought-she-was-about-to-die-1.5678023 https://www.cbc.ca/radio/asithappens/as-it-happens-friday-ed...
  - tamersalama 6y ago
    A different couple
  - orblivion 6y ago
    That's actually a _different_ wedding photo, happening at exactly the same time: https://www.youtube.com/watch?v=GQssU3dTKUs https://www.youtube.com/watch?v=GQssU3dTKUs
supernova87a 6y ago
Wow, you can really see in the glass reflections, the arrival of the ground compression (?) waves fractions of a second before the air pressure wave hits. And the wife notices it before the husband does.
miketery 6y ago
Is the sound faster than the shockwave or same speed? I think same speed. Might have been a previous explosion that triggered the look before the main one.
- gpm 6y ago
  I think you're hearing/seeing the difference between the speed of sound through the ground, and through the air.
  - jhrmnn 6y ago
    Sound moves 4-times faster in water than in air, I assume even faster in ground surface, so let’s just assume it arrives instantly via ground. This would mean a delay like in lightning/thunder, which is what one can see in the video (2–3 seconds ~ 0.5–1 km). (This is the restaurant https://goo.gl/maps/td5K1vxUDBN4i1CA8 https://goo.gl/maps/td5K1vxUDBN4i1CA8) But I could equally imagine it’s some lesser explosion before the main blast.
- numpad0 6y ago
  Object moves -> air goes back and forth -> your eardrum moves -> pressure pattern over time registers as sound as a 20-20kHz ish spectrum captured at 0.1s ish timesteps Supersonic airplanes move past the speed of sound(280-340m/s in air) and generate wavefront at its interfaces with air but the resulting disjoint tsunami wave expands at the speed of sound and heard as single ‘bang’ when it reaches ears or microphones So there’s no way one could hear the bang through air before visual bang hits However the speed of sound is about 10x faster on solid mediums such as ground or seawater so could be those
  - m0zg 6y ago
    It's actually two "bangs" for a plane. Tum-dum. Source: grew up about 100km away from a military air base in Russia at which at least a couple planes went supersonic almost every day for years. You can hear several sonic booms in this video, although they're from low-flying planes: https://www.youtube.com/watch?v=jmhU7SEo4gg https://www.youtube.com/watch?v=jmhU7SEo4gg. The higher the plane, the more distinct and "bassy" the "booms". Here's another example, a bit higher, a bit more distinct: https://www.youtube.com/watch?v=M_KbZON5sW0 https://www.youtube.com/watch?v=M_KbZON5sW0
deleted 6y ago
[deleted]
booleandilemma 6y ago
Why does the camera lens not shatter in this case? And in the same vein, what happens to peoples’ eyeglasses? Does anyone know?
- crooked-v 6y ago
  Eyeglass lenses are usually made from plastic or polyurethane variants these days, as they can be much lighter, thinner, and tougher than glass with similar-enough optical properties to cover the needs of most eye conditions.
  - mnl 6y ago
    I consider PC a wonder material yet I went back to 1.7 AR coated glass (higher than that it's a bit overkill unless you really need it IMO). It's crisper, actually cheaper, heat resistant and virtually scratch proof if you clean it properly. It's heavier but I'm not going back to finding pinpricks after bouts of wind and all the extra care. The thing about glass is that it can shatter upon impact, plastic lenses won't but basically get ruined all the same in my experience.
    - pletnes 6y ago
      I’ve not seem glass as an option recently. I miss having glass glasses for the exact reasons you describe. Worn plastic is scratched and give nasty artifacts.
- DanTheManPR 6y ago
  The ratio of the thickness of the glass compared to the unsupported span of material makes them relatively much more rigid than a big, floppy pane of glass. A glass window is not only much less rigid, but also maximizes the surface area that pressure from the blast wave can push against.
  - pauljurczak 6y ago
    This and the fact that eyeglasses are usually not firmly attached to a huge chunk of reinforced concrete.
deleted 6y ago
[deleted]
walrus01 6y ago
RT/RUPTLY is well known for stealing other peoples' video and putting their huge gaudy watermark on it. Here is the same video where at least the media logo is on the bottom right corner. https://www.youtube.com/watch?v=VBV8nnp98vc https://www.youtube.com/watch?v=VBV8nnp98vc
rapnie 6y ago
I was around during the Enschede, Netherlands fireworks factory explosion [0], just outside the radius where all glass shattered. Saw the glass ripple effect along a line of appartment buildings with full-height windows. A really astounding sight I'll never forget. With the amount of curvature caused by the shockwave it seemed these windows must surely break. But they did not. [0] https://en.wikipedia.org/wiki/Enschede_fireworks_disaster https://en.wikipedia.org/wiki/Enschede_fireworks_disaster

odysseus 6y ago

Oh no. I really hope the bride and groom are OK!

stan_rogers 6y ago
They're fine. And she's an MD who spent the better part of the rest of that day doing what she could for the people around her. https://www.cbc.ca/radio/asithappens/as-it-happens-friday-edition-1.5678021/beirut-bride-seen-in-viral-video-says-she-thought-she-was-about-to-die-1.5678023 https://www.cbc.ca/radio/asithappens/as-it-happens-friday-ed...
- tamersalama 6y ago
  A different couple
- orblivion 6y ago
  That's actually a _different_ wedding photo, happening at exactly the same time: https://www.youtube.com/watch?v=GQssU3dTKUs https://www.youtube.com/watch?v=GQssU3dTKUs

supernova87a 6y ago

Wow, you can really see in the glass reflections, the arrival of the ground compression (?) waves fractions of a second before the air pressure wave hits. And the wife notices it before the husband does.

miketery 6y ago

Is the sound faster than the shockwave or same speed? I think same speed. Might have been a previous explosion that triggered the look before the main one.

gpm 6y ago
I think you're hearing/seeing the difference between the speed of sound through the ground, and through the air.
- jhrmnn 6y ago
  Sound moves 4-times faster in water than in air, I assume even faster in ground surface, so let’s just assume it arrives instantly via ground. This would mean a delay like in lightning/thunder, which is what one can see in the video (2–3 seconds ~ 0.5–1 km). (This is the restaurant https://goo.gl/maps/td5K1vxUDBN4i1CA8 https://goo.gl/maps/td5K1vxUDBN4i1CA8) But I could equally imagine it’s some lesser explosion before the main blast.
numpad0 6y ago
Object moves -> air goes back and forth -> your eardrum moves -> pressure pattern over time registers as sound as a 20-20kHz ish spectrum captured at 0.1s ish timesteps Supersonic airplanes move past the speed of sound(280-340m/s in air) and generate wavefront at its interfaces with air but the resulting disjoint tsunami wave expands at the speed of sound and heard as single ‘bang’ when it reaches ears or microphones So there’s no way one could hear the bang through air before visual bang hits However the speed of sound is about 10x faster on solid mediums such as ground or seawater so could be those
- m0zg 6y ago
  It's actually two "bangs" for a plane. Tum-dum. Source: grew up about 100km away from a military air base in Russia at which at least a couple planes went supersonic almost every day for years. You can hear several sonic booms in this video, although they're from low-flying planes: https://www.youtube.com/watch?v=jmhU7SEo4gg https://www.youtube.com/watch?v=jmhU7SEo4gg. The higher the plane, the more distinct and "bassy" the "booms". Here's another example, a bit higher, a bit more distinct: https://www.youtube.com/watch?v=M_KbZON5sW0 https://www.youtube.com/watch?v=M_KbZON5sW0

deleted 6y ago

[deleted]

booleandilemma 6y ago

Why does the camera lens not shatter in this case? And in the same vein, what happens to peoples’ eyeglasses? Does anyone know?

crooked-v 6y ago
Eyeglass lenses are usually made from plastic or polyurethane variants these days, as they can be much lighter, thinner, and tougher than glass with similar-enough optical properties to cover the needs of most eye conditions.
- mnl 6y ago
  I consider PC a wonder material yet I went back to 1.7 AR coated glass (higher than that it's a bit overkill unless you really need it IMO). It's crisper, actually cheaper, heat resistant and virtually scratch proof if you clean it properly. It's heavier but I'm not going back to finding pinpricks after bouts of wind and all the extra care. The thing about glass is that it can shatter upon impact, plastic lenses won't but basically get ruined all the same in my experience.
  - pletnes 6y ago
    I’ve not seem glass as an option recently. I miss having glass glasses for the exact reasons you describe. Worn plastic is scratched and give nasty artifacts.
DanTheManPR 6y ago
The ratio of the thickness of the glass compared to the unsupported span of material makes them relatively much more rigid than a big, floppy pane of glass. A glass window is not only much less rigid, but also maximizes the surface area that pressure from the blast wave can push against.
- pauljurczak 6y ago
  This and the fact that eyeglasses are usually not firmly attached to a huge chunk of reinforced concrete.

deleted 6y ago

[deleted]

walrus01 6y ago

RT/RUPTLY is well known for stealing other peoples' video and putting their huge gaudy watermark on it. Here is the same video where at least the media logo is on the bottom right corner. https://www.youtube.com/watch?v=VBV8nnp98vc https://www.youtube.com/watch?v=VBV8nnp98vc

rapnie 6y ago

I was around during the Enschede, Netherlands fireworks factory explosion [0], just outside the radius where all glass shattered. Saw the glass ripple effect along a line of appartment buildings with full-height windows. A really astounding sight I'll never forget. With the amount of curvature caused by the shockwave it seemed these windows must surely break. But they did not. [0] https://en.wikipedia.org/wiki/Enschede_fireworks_disaster https://en.wikipedia.org/wiki/Enschede_fireworks_disaster