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thank for a moment about how loud the
loudest sound that you've ever heard in
your life was if you're hearing my voice
right now after experiencing an incident
like that than it was nowhere near the
loudest sound that has ever happened
humans at various points in history have
heard sounds so loud from a source that
they heard them from thousands of
kilometers away from their actual origin
but before I can explain what the
loudest sound was and how incredible it
is I first need to explain how sound is
measured in terms of loudness in the
first place this image here is a sound
wave for the purpose of this video all
you need to know about really is the
amplitude of the wave because it's the
amplitude that determines how loud a
sound appears to be to humans the
decibel scale is what's used to measure
the loudness of a sound and it's
important to note that the scale is
logarithmic this means that 10 decibels
is 10 times more powerful than zero
decibels and 20 decibels is 10 times
more powerful than 10 decibels but 100
times more powerful than zero decibels
with all of that in mind let's start
building our way up to the loudest sound
in history by beginning at 10 decibels
which is about how loud standard human
breathing is and is barely audible to
the average human 10 times more powerful
than this at 20 decibels is the rustling
of leaves in the wind and then 10 times
more powerful than that at 30 decibels
is a whisper we're still in pretty quiet
territory so moving higher up to 44
decibels is the average ambient noise
that's present in a library a little bit
higher than that at 50 decibels is the
noise of a normal conversation in your
home and 10 times more powerful than
that at 60 decibels is the noise of a
normal conversation in a restaurant 70
decibels is about the noise that a
vacuum cleaner produces and it's a good
comparison for all the noises that are
coming up next twice as loud as that at
80 decibels is the noise created by a
garbage
disposal and four times as loud as a
vacuum cleaner at 90 decibels is the
noise that you would hear from a
motorcycle engine if you were seven and
a half meters away from it 100 decibels
would be eight times louder than a
vacuum cleaner and is roughly the noise
produced by operating a jackhammer twice
as loud as that though at 110 decibels
is the average threshold that humans
begin to experience pain at and 108 to
114 decibels is the average noise
produced at a rock concert my friends
over at airplane mode created a video
about the value of music produced at
concerts like this so make sure to check
out their video next in the description
a chainsaw produces a noise of 120
decibels which is 32 times louder than
the vacuum cleaner is a shotgun firing
right next to you is about 130 decibels
and about the loudest noise that you'll
probably ever likely hear in your life
is a passenger jet taking off if you
were standing 25 meters away from it
which would be around 150 decibels this
is also the level of sound that can
immediately rupture your eardrums
instantly if you're ever exposed to it
but the loudest sound ever heard by
humans that we've been building up to
this entire time was unbelievably more
loud than this in the spring of 1883 the
volcanic island of Krakatoa in
modern-day Indonesia exploded with the
force of 200 megatons a force so
powerful it obliterated the entire
island I've talked about to this
eruption before in a previous video but
I didn't spend much time talking about
the noise that it generated any sound
over 194 decibels begins to distort into
more of a shock wave from an explosion
rather than an actual sound wave but the
Krakatoa eruption generated an estimated
310 decibels at the epicenter of the
explosion this force was so loud that
sailors located 64 kilometers away from
the blast had their eardrums ruptured
the noise was even loud
though than this may seem at first
because a pressure gauge located 161
kilometers away measured a sound of 180
decibels it would have taken the sound
about 7 minutes and 53 seconds to reach
that far from the volcano and it still
would have been enough to not only
rupture your eardrums if you were
standing there but also knock the wind
out of your lungs and shatter glass
windows on buildings it's possible you
could have actually died from the sound
waves impacting and smashing through
your body but even if you didn't you
would be guaranteed to be permanently
deaf for life afterwards if the sound
from the blast originated in Central
Park in New York City instead then
everybody located inside of this circle
would either be dead or permanently deaf
for life afterwards
in real life the volcanic blast was
heard as far away as Perth Australia
whose residents reported hearing what
sounded like gunshots
it was also heard on the Indian Ocean
island of Rodrigues 4,800 kilometers
away whose residents reported what they
believed to be cannon fire imagine if
this time you were standing in Central
Park and you heard what sounded like a
cannon firing somewhere around you only
to find out later that the sound didn't
come from near you at all but rather
came all the way from Ireland and it
took a time of nearly four hours to
reach your ears the sound wave began to
grow less and less audible to humans the
farther a travelled until the frequency
became too low to be heard even though
the waves couldn't be heard by humans
themselves past a certain range our
instruments detected that the waves
generated from the blast circled around
the entire planet three and a half times
so the next time you turn on your
speakers with the volume a little too
high at least it won't be loud enough to
cause a global catastrophe but if you
want a good speaker to listen to some of
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up to 12 hours using this which is about
how long it took the sound wave from the
Krakatoa blast to arrive in San Diego
you
could have written this wave for 12
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since the speaker is water-resistant it
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you again soon on Friday for another new
real-life lore video then
[Music]