Probably bad for your hearing too (piefedimages.s3.eu-central-003.backblazeb2.com)
 

For reference, the loudest sound ever on earth was 180dB https://wikipedia.org/wiki/1883_eruption_of_Krakatoa

Fun fact. Adam West Batman has an audio communicator capable of producing "20,000 decibles', while this is only used to scare off a tiger, this would realistically be powerful enough to create a black hole and destroy the universe

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[–] 146 points 1 year ago (21 children)

For reference, the theoretical maximum of sound with air as medium is 196db.

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  • [–] 50 points 1 year ago* (last edited 1 year ago) (16 children)

    at what dB does the air ignite from the vibration of molecules

    edit: okay so air does not ignite, but allows other things to ignite, but methane is one of those things in air so I reformulate the question as such:

    what pressure of air is needed to produce sufficient heat to ignite any methane trapped within it, and what dB level is needed to form such compression even if for mere nanoseconds?

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  • [–] 15 points 1 year ago (12 children)

    Apparantly depends on the medium and the type of wave being measured in dB.

    At that point it can’t be sound waves, but potentially shockwaves could start to heat the air up.

    Eventually with high enough temperature you can get air to become plasma, any matter in the air might burn but the air itself will not.

    -not a scientist

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  • [–] 7 points 1 year ago (6 children)

    I mean sounds is just differently compressed medium, usually air. Why are shock waves not sound waves?

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  • [–] 5 points 1 year ago (2 children)

    Don't ask me, i am left with the exact same question myself. Which is why i felt the need to add the not a scientist disclaimer.

    Though i did some research just now and its because the waves exhibit different very different properties

    It might be a chicken and egg thing. Does it have different properties because it is fundamentally different, Or did we call it different because different properties emerged under different conditions (like having more energy)

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  • [–] 3 points 1 year ago* (1 child)

    Okay if you are talking about sound waves, they’re not really waves in the traditional sense. They are waves because it tracks the compactness/vibrations.

    The reason why sound transfers faster in solids is because the atoms are more rigid due to, you know, being a solid.

    If you pump enough energy into it, won’t you start doing funny things?

    Ie: if you put enough energy into a rigid material there’s a point where it stops being able to take the force and breaks

    I’m also not a scientist and also am the wrong type of engineer too so…

    I’d imagine if you compact things faster than the energy can leave the immediate area, you’d run into funny phenomenons with the temperature/pressure/state of matter histogram.

    Which brings me to my question of what is a shock wave if not a sound wave?

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  • [–] 4 points 1 year ago

    Speaking from how i intuitively feel about the science..

    It looks like waves can exists on a spectrum from low energy to high energy and the more energy you add the more there is potential for complex reactions, the more new properties emerge and thus the more potential damage there can be done to given matter.

    dB can be seen as the measurement of vibration that is usually used for the range of waves we call sound waves but i see no reason why it cant work outside the scope.

    So technically feel the waves are really the same, but then compare that to the electromagnetic spectrum and we label some ranges as colors.

    If red is the color that makes us angry. And green makes us calm. Then the question we are asking is: What shade of green do we need to make us angry?

    Because were getting hung up on the fact there both measurements of photonic light, so essentially the same?

    Is that a fair comparison? Can someone get a real scientist in the room please?

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  • [–] 1 point 1 year ago (2 children)

    So speed of sound is the speed of compression. When you get past the speed of sound (or the speed that the material propagates) it becomes more like solid I think.

    • my understanding from wikipedia
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  • [–] 0 points 1 year ago (4 children)

    Im just gonna throw a number out there and use the wisdom of crowds via up/downvotes to estimate its validity

    350db

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  • [–] 5 points 1 year ago (2 children)
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    [–] 123 points 1 year ago (14 children)

    The decibel scale is logarithmic, meaning that a 20,000 dB sound would carry an unimaginable amount of energy.

    A hypothetical 20,000 dB sound would have an overpressure of approximately 5 x 10^499 atmospheres, enough energy to obliterate the Earth instantly.

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  • [–] 56 points 1 year ago (3 children)

    And definitely scare off the tigers

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  • [–] 9 points 1 year ago (4 children)
  • [–] 4 points 1 year ago* (3 children)

    Amazingly, given the relatively slow speed of sound, you might actually see it coming. For a moment or two at least, before you're vaporized or whatever.

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  • [–] 1 point 1 year ago* (2 children)

    Hmm. It wouldn't stay sound for long. The molecules would be banging together so hard that you'd get all sorts of interesting nuclear reactions. I'm not guessing how that turns out. But, for sure, you'd get a lot of EM radiation coming at you at the speed of light.

    ETA: Come to think of it. You'd also get unknown gravitational phenomena, also travelling at the speed of light. Presumably. The data would be invaluable for unifying relativity and quantum physics. Definitely dead before you know, though.

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  • [–] 2 points 1 year ago (1 child)

    Yeah, I was just thinking of like an extremely powerful soundwave, but I guess I just can't really imagine what a blast of that magnitude would look/behave like.

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  • [–] 1 point 1 year ago

    No worries. No one can. Everything we can observe is perfectly explained either by relativity or quantum physics, but never both. They are incompatible theories, which are applied in different conditions. In such extreme conditions, both would apply. IE, we don't have a theory for it.

    Since we cannot create anything remotely close to such conditions, like a black hole, we do not have the data to create such a theory. Just like AI, we are limited by our training data.

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    [–] 100 points 1 year ago (21 children)

    20000 decibel, or 2 kilobel

    yes, deci- is the si prefix for ^1^/10. the actual unit is the bel.

    i am saddled with this cursed knowledge so now you must be too.

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  • [–] 28 points 1 year ago (11 children)

    Are you a fellow PAG/NAG calculator, too?

    More cursed knowledge (for them, probably not you): it's logarithmic so every 3dB increase is double the energy!

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  • [–] 9 points 1 year ago* (last edited 1 year ago) (5 children)

    When I was in my first year of college - 26 years ago - I asked a question about logarithms and was thoroughly, angrily (and, looking back on the event, probably justifiably) reamed out by another student about it.

    I don't think I publicly spoke up for the rest of that class.

    edit: Remove extra words.

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  • [–] 13 points 1 year ago (4 children)

    I'm gonna go out on a limb and say it probably wasn't justified to respond to a math question like that lol

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  • [–] 12 points 1 year ago (2 children)

    I think it was an overreaction in terms of its delivery, but I was homeschooled and started college early. I was the stereotypical socially inept homeschooler. The class was introduction to college algebra, which doesn't usually cover logarithms AFAIK; I brought them up unprompted during a quiet moment when the teacher was cleaning the whiteboard. I was curious about them because I had been reading my older brother's textbooks and found them interesting.

    The other student's complaint about me was that I monopolized the teacher's attention by sitting front and center and raising my hand for every question. Additionally she felt that I was trying to show off. At that point I was also very visibly younger than everyone else, which did occasionally annoy people. (This became less of an issue when I hit puberty and started growing a beard.)

    But I was oblivious to those kinds of things at the time and didn't realize I was having any kind of impact on anyone else in the class until the other student chastised me. Perhaps it was an overreaction, but the message was one I needed to hear, I think.

    Also, to their credit, that student did apologize to me, more calmly expressing the nature of their grievances; I apologized in turn and said that I would try to be less disruptive.

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  • [–] 28 points 1 year ago (12 children)

    Wonder if they got hertz and decibels confused when they were writing that.

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  • [–] 19 points 1 year ago (6 children)

    So Batman was trying to annoy the tiger away? I think more likely the schlock tv 60s kids show writers just had no idea what they were talking about

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  • [–] 10 points 1 year ago (4 children)

    Why wouldn't they have just googled it?

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  • [–] 4 points 1 year ago

    Alternatively they knew exactly what they meant.

    This was their version of 2 people typing to fight off a hacker. I would not be surprised to hear that Adam West created a GUI interface in Visual Basic to track an IP address.

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  • [–] 4 points 1 year ago (3 children)

    Wouldn't that be a bit low? I haven't seen the show but I assume its something humans can't hear but tigers can. Although it is much more reasonable than the insane 20000 db they claim.

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  • [–] 3 points 1 year ago* (2 children)

    Human hearing ranges from approximately 20 hz through 20,000 hz

    https://en.m.wikipedia.org/wiki/Hearing_range

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  • [–] 2 points 1 year ago

    Approximately. It differs a lot and the upper limit goes down with age. It also depends on loudness. I could hear up to around 16 kHz in my early twenties. I doubt many adults would hear 20 kHz, unless it was very, very loud.

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  • [–] 26 points 1 year ago

    This means Adam West Batman is the most powerful.

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  • [–] 20 points 1 year ago (1 child)

    That's a very..alternative usage of the word "realistically" 😄

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  • [–] 10 points 1 year ago (1 child)

    My back-of-the-envelope calculation says this would result in about 2·10^995^ Pa of sonic pressure. I could be way off, but yeah... the creation of a black hole seems likely.

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  • [–] 8 points 1 year ago (6 children)

    Maybe they ment to say 20khz?

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  • [–] 8 points 1 year ago (5 children)

    The writers for the show weren’t too concerned with scientific accuracy. It’s intentionally silly.

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  • [–] 5 points 1 year ago (4 children)

    I can remember an episode where people get dehydrated into a powder - and later get rehydrated lol

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  • [–] 2 points 1 year ago (1 child)

    People dehydrating into a powder was also a part of a Start Trek: TOS episode. I don't think they came back though. Probably some red shirts.

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  • They came back just in the Adam West Batman series, it was a rather strange version of quantum entanglement.

    You know I am just shit posting but knowing both TOS and Adam West Batman I wouldn't be surprised if this is how they'd do a crossover.

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  • [–] 8 points 1 year ago

    i mean, if batman only says decibels, we don't know the reference value; SPL was never specified.

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  • [–] 6 points 1 year ago

    Good 'ol prep time

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  • [–] 5 points 1 year ago

    So about half of my upstairs neighbors teaching elephants to tap dance at 3AM.

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  • [–] 4 points 1 year ago (7 children)

    Why would it create a black hole?

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  • [–] 17 points 1 year ago*

    Matter energy equivalence, and the fact that decibels are a logarithmic scale. I found a reddit reply (I know, I know) that someone has done the math on, though I haven't checked if it's right. Anyway, it said:

    20,000 decibels is 10^1997  watts, which is 10^1997  joules/second.

    I think we can use P = p²/Z, where Z is 415 kg/m²s (impedance of air), to correlate our power P and the pressure p. So, p = sqrt(P/Z) which is still going to be on the order of 10^997  pascals.

    The threshold we care about is 10^32  pascals, which is the pressure at which neutrons overcome their "degeneracy pressure", a pressure which prevents them from being too tightly packed. So, yes, that could collapse matter into black holes for sure for sure, since we're beating it by 965 orders of magnitude. Also, the pressure inside the sun is roughly 10^16  pascals.

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  • [–] 7 points 1 year ago

    Because sound is waves. You can feel your chest pounding when you're standing next to a loud speaker during a live concert. Energy from a 20000dB "source" would create an unimaginable blast wave.

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  • [–] 2 points 1 year ago (4 children)
  • [–] 4 points 1 year ago

    It's a logarithmic scale.

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  • [–] 4 points 1 year ago (3 children)

    This sounds like bullshit to me

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