Yep, I do. Their reasoning was to save them for the health care professionals since people were buying them en masse. And, many people who were wearing them were still not using them correctly, touching their face, etc. Later on it became a measure to mass-slow the spread, given how contagious covid-19 is how quickly the numbers were racking up
There shouldn’t be a huge difference. This is all about the air flow. The surgical mask will disrupt it pretty well. To see what I mean put on a mask hold your hand in front of you mouth and blow. Even blowing your hardest you can only feel it a few inches away. Depending on if I make it a wide stream or not maybe 5 or 6 inches. So it’s definitely going to do the job when you just breathing or talking normal. Obviously an n-95 would do better but a regular one is plenty
That is a PROPERLY fitted N95 mask. Also note the man is cleanly shaven. With 5 o'clock shadow you would see a cloud around his face. It is also important to note he is not exhaling harder than a passive breathing pattern. You can see it in his chest movements and the mask is not moving, yet the other frame shows his head bobbing from the exhale. This is the side view and the way they have it set up it does not show leakage on the sides. A frontal view with the right contrasts would be interesting. the other point is they are not using a good contrast setting that shows the full air flow. If you wanted to really show what was going on, do this in a walk in freezer with 0 deg F or colder to get real contrast. Nor do they demonstrate it with the cheap surgical masks, washable masks or the industrial N60 grade masks. The results would be different.
Please tell us what kind of mask was used here? It's important to know how much the different types of masks affect air flow. I'm hoping this is not actually the high quality n95 mask but a simpler mask. I I suspect that many masks will have similar effects but it would be great to show that the less effective masks still make a big difference!
If you want protect people around you and yourself you need mask without back flow valve. If only yourself then possible to buy with valve, outgoing air from you will be forced from it, but mainly to a floor direction. Some data was here fastlifehacks.com/n95-vs-ffp/ Main message even mask fp3 or n99 do not fully protect yourself, all masks are made against particles 2.5um, but virus is around 1um. this give protection around 50% and higher (either on that site was info or found somewhere in internet) some extra info th-cam.com/video/dGw3fXkFtqo/w-d-xo.html I think the best one is the abek respirator made for painting. It contain ffp3 and additional aerosol blocking carbon filter. In a case if you don't have any mask put something on a face. In this case better something than nothing.
Finally, a video showing how masks help! Thank you Please do a video illustrating exhaled air flow in a typical office setting with low-walled and high-walled cubicles, both with traditional employee spacing and at various wider spacings. This is information companies should use before they open up for business.
Yep, this video is pointless, all it does is show that it 'might help' people who are already sick from spreading the virus, but how many fools think that masks will protect them from getting it?
This does seem a bit contrived, with different subject breathing states on left compared to right. When considering that a person's net volumetric flow rate is pretty much metabolically driven and thus constant, for a healthy person breathing under normal conditions, It would seem that in at least some cases, masks would decrease the cross sectional area of through which the breath is going, and consequentially increase the vapor velocity. Non-laminar flow characteristics introduced in many practical cases could result in a net reduction in droplet diffusion, but can this really be reliably said? (Weiss et. al. claim that normal breathing droplet size < 20 μm)
4 ปีที่แล้ว
Does that size mean droplets would not behave like bullets from a pistol travelling potentially farther than the gases? I know nothing about laminar flow, I was assuming denser/heavier particles would be less dampened.
Can you make a video showing the use of a mask with a valve? Really curious about how much viral spread would occur through the valve found on many masks.
No. Regular schlieren techniques do not resolve aerosolized particles. The assumption is that aerosol particles get advected by the cough airflow and imaging that will lead to an estimation of the maximum dispersal region of aerosols. To be able to get aerosol particle number density and size distributions, one needs to use some sort of laser scattering techniques.
Camera resolution is probably not very relevant here but the schlieren images look like they're sensitive to light ray deflections in the range of 5 arcseconds.
Aren't the emmissions we're seeing radiating off his body (in blue) simply heat flows? What happens to the virus when the heat dissipates? does it dissappear too?
What type of mask is this? I'm interested in wearing a homemade mask (I don't want to detract from medical supplies) but it would be great to get a sense of how effective they are. I know they're nowhere near as effective of medical ones, but even a 50% is still excellent imho, and far better than nothing. Any info you have on that would be great! Excellent video! Very interesting! 🙏💫
Abstract A shortage of disposable filtering facepiece respirators can be expected during a pandemic respiratory infection such as influenza A. Some individuals may want to use common fabric materials for respiratory protection because of shortage or affordability reasons. To address the filtration performance of common fabric materials against nano-size particles including viruses, five major categories of fabric materials including sweatshirts, T-shirts, towels, scarves, and cloth masks were tested for polydisperse and monodisperse aerosols (20-1000 nm) at two different face velocities (5.5 and 16.5 cm s−1) and compared with the penetration levels for N95 respirator filter media. The results showed that cloth masks and other fabric materials tested in the study had 40-90% instantaneous penetration levels against polydisperse NaCl aerosols employed in the National Institute for Occupational Safety and Health particulate respirator test protocol at 5.5 cm s−1. Similarly, varying levels of penetrations (9-98%) were obtained for different size monodisperse NaCl aerosol particles in the 20-1000 nm range. The penetration levels of these fabric materials against both polydisperse and monodisperse aerosols were much higher than the penetrations for the control N95 respirator filter media. At 16.5 cm s−1 face velocity, monodisperse aerosol penetrations slightly increased, while polydisperse aerosol penetrations showed no significant effect except one fabric mask with an increase. Results obtained in the study show that common fabric materials may provide marginal protection against nanoparticles including those in the size ranges of virus-containing particles in exhaled breath. academic.oup.com/annweh/article/54/7/789/202744
Literally not one person wears that mask outside of these “tests”. It also has to be perfectly fit which is impossible unless you are constantly touching it which is a big no no. I swear ima have to start doing tests myself just to prove how inaccurate this is.
Thanks so much for sharing this. The use of masks and protection can change many things in the world considering that the GDP of many countries is deteriorating very quickly and the mask may become an alternative to the lockdown.
So if I'm wearing a mask and standing in front of the guy who isn't wearing one, I can still get sick because his germs can still sneak inside of my mask like the movie Alien right?
I have few queries, what we see here are they vapours? Droplets might not necessarily as hot as this vapours so are the droplets actually being captured in this method? The size of droplets must be very small and the spread may be large, in that case is the resolution enough? A coughing/sneezing person will jet droplets at higher rate , in that case is the framing rate enough? Please ignore if you feel this questions are not relevant and pardon my foolishness
its a background-oriented Schlieren setup (BOS), using a "regular" CCD/CMOS camera and a textured background. The rest is image processing, looking at small displacements of the background image caused by changes of index of refraction in the media between camera and background pattern
Was this in a controlled environment with zero ambient air flow? If so it’s an unrealistic setting. Of course waves propagate long distances when there’s nothing to dampen them.its why a tsunami in japan can make it to California coast. But normal air environments have ambient flow which dampens waves. It’s why you don’t smell people’s breath unless really upclose.
Because it's a visualization of the heat sources. The breath that the person is breathing out is higher temperature than the surrounding air, so it is nicely visualized. The human body is also emitting heat into its surrounding air by heat conduction, so it is also emanating heat, which when visualized here, looks like it's like melting into the air.
Hi, sorry to nit pick, but why did you compare someone coughing without a mask to someone NOT coughing with a mask? btw, I want to be able to show my friends who believe in the conspiracy, but after so many years I know the questions they'll ask. This does not help prove anything
Not convincing as obvously the numan to human contact energetically and otherwise far exceeds any ability we may conceive of to mitigate it. LESSON: Stay healthy and adapt to whatever lurks in the environment.
AH! (His power level is unreal. The aura he's seeping is beyond that of a normal human.)
It's over 9000!
Darkness19 * UI theme starts playing*
I thought that it was his charisma
You mean the heat he is giving off?
Ok, but that isn't the cloth masks that everyone is wearing around. Can you reshoot this showing how effective wearing one of those is?
Nice request I second this
Yes pls do!
it's basically the same. I'm trying to find the video covering this
@@foxfire1112 any luck?
@@foxfire1112 Bullshit. Source, or it is complete BS.
What about a surgical mask, or a home make cloth mask? I'd love to see a comparison of different masks.
Yep, I do. Their reasoning was to save them for the health care professionals since people were buying them en masse. And, many people who were wearing them were still not using them correctly, touching their face, etc. Later on it became a measure to mass-slow the spread, given how contagious covid-19 is how quickly the numbers were racking up
Yeah, I’m very interested in seeing other masks, from bandanas to multiple layer homemade to surgical
There shouldn’t be a huge difference. This is all about the air flow. The surgical mask will disrupt it pretty well. To see what I mean put on a mask hold your hand in front of you mouth and blow. Even blowing your hardest you can only feel it a few inches away. Depending on if I make it a wide stream or not maybe 5 or 6 inches. So it’s definitely going to do the job when you just breathing or talking normal. Obviously an n-95 would do better but a regular one is plenty
Please do a comparison between homemade mask, surgical mask and N95 respirator
Well, n95 is 100% protection. It has been tested and certified already. But homemade vs surgical, definitely!
@@Shineinpoverty n95 is 95% hence the 95
That is a PROPERLY fitted N95 mask. Also note the man is cleanly shaven. With 5 o'clock shadow you would see a cloud around his face. It is also important to note he is not exhaling harder than a passive breathing pattern. You can see it in his chest movements and the mask is not moving, yet the other frame shows his head bobbing from the exhale. This is the side view and the way they have it set up it does not show leakage on the sides. A frontal view with the right contrasts would be interesting. the other point is they are not using a good contrast setting that shows the full air flow. If you wanted to really show what was going on, do this in a walk in freezer with 0 deg F or colder to get real contrast. Nor do they demonstrate it with the cheap surgical masks, washable masks or the industrial N60 grade masks. The results would be different.
Can you do this while wearing a Bane mask?
Please tell us what kind of mask was used here? It's important to know how much the different types of masks affect air flow. I'm hoping this is not actually the high quality n95 mask but a simpler mask. I I suspect that many masks will have similar effects but it would be great to show that the less effective masks still make a big difference!
If you want protect people around you and yourself you need mask without back flow valve.
If only yourself then possible to buy with valve, outgoing air from you will be forced from it, but mainly to a floor direction.
Some data was here fastlifehacks.com/n95-vs-ffp/
Main message even mask fp3 or n99 do not fully protect yourself, all masks are made against particles 2.5um, but virus is around 1um. this give protection around 50% and higher (either on that site was info or found somewhere in internet)
some extra info th-cam.com/video/dGw3fXkFtqo/w-d-xo.html
I think the best one is the abek respirator made for painting. It contain ffp3 and additional aerosol blocking carbon filter.
In a case if you don't have any mask put something on a face. In this case better something than nothing.
Finally, a video showing how masks help! Thank you
Please do a video illustrating exhaled air flow in a typical office setting with low-walled and high-walled cubicles, both with traditional employee spacing and at various wider spacings. This is information companies should use before they open up for business.
Yep, this video is pointless, all it does is show that it 'might help' people who are already sick from spreading the virus, but how many fools think that masks will protect them from getting it?
Only fools who are not reading the title! There it is clearly written that it is about the restriction of EXHALED air!
you're asking for that much time & effort/equipment, I hope you're paying for this commission!
This aged well
😂😂 this still makes me laugh I go back to it when I've done something stupid or dumb I read this and it makes realize I'm not that dumb 😭😂😂
It’s an enemy stand!
Beautiful chakra control
Hope to see the comparison between surgical mask, furthermore with normal mask (dust-proofed) and cotton mask
Stand name: World on fire
Power: A
Speed: B
Range: E
Durability: C
Precision: D
Potential: B
With mask: OH-HO you're not approaching me?
Without mask: I can't get any closer without kicking your ass!
This does seem a bit contrived, with different subject breathing states on left compared to right. When considering that a person's net volumetric flow rate is pretty much metabolically driven and thus constant, for a healthy person breathing under normal conditions, It would seem that in at least some cases, masks would decrease the cross sectional area of through which the breath is going, and consequentially increase the vapor velocity. Non-laminar flow characteristics introduced in many practical cases could result in a net reduction in droplet diffusion, but can this really be reliably said? (Weiss et. al. claim that normal breathing droplet size < 20 μm)
Does that size mean droplets would not behave like bullets from a pistol travelling potentially farther than the gases? I know nothing about laminar flow, I was assuming denser/heavier particles would be less dampened.
it rivals the power of a God Of Destruction!
-DBZ Angel
Can you make a video showing the use of a mask with a valve? Really curious about how much viral spread would occur through the valve found on many masks.
for the above & the valve, you're to maintain 2m social distancing & you'll be aright, mate!
Who else came from Daily Dose of Internet?
me
Me!!!!
Mee
yup, but never going back if I can help it. That guy sounds so bored & uninterested/flat, not the voice of an internet show/vlog.
MEEEEEEEE!!! HAHAHAHAA
What resolution does Schlieren imaging + Camera have? Im not sure if this reliably resolves aerosol dispersion.
No. Regular schlieren techniques do not resolve aerosolized particles. The assumption is that aerosol particles get advected by the cough airflow and imaging that will lead to an estimation of the maximum dispersal region of aerosols.
To be able to get aerosol particle number density and size distributions, one needs to use some sort of laser scattering techniques.
Camera resolution is probably not very relevant here but the schlieren images look like they're sensitive to light ray deflections in the range of 5 arcseconds.
Why no front angle, is there jets of air shooting up, down, and out the sides?
Wow finally a video showing how mask can protect someone's chin from moving during talking. And even from cough!
Aren't the emmissions we're seeing radiating off his body (in blue) simply heat flows? What happens to the virus when the heat dissipates? does it dissappear too?
There is a lot of discussion about using face shields only. With mask supplies limited, can you share a similar flow vis for face shield without mask?
He is about to become super saiyen.
Please make more videos like these for covid awareness
Love how it fails to show the cloud around and behind the person.... Great job..... You made a video that will convince those who already agree
Hi! What about face shields?
What type of mask is this? I'm interested in wearing a homemade mask (I don't want to detract from medical supplies) but it would be great to get a sense of how effective they are. I know they're nowhere near as effective of medical ones, but even a 50% is still excellent imho, and far better than nothing. Any info you have on that would be great! Excellent video! Very interesting! 🙏💫
Abstract
A shortage of disposable filtering facepiece respirators can be expected during a pandemic respiratory infection such as influenza A. Some individuals may want to use common fabric materials for respiratory protection because of shortage or affordability reasons. To address the filtration performance of common fabric materials against nano-size particles including viruses, five major categories of fabric materials including sweatshirts, T-shirts, towels, scarves, and cloth masks were tested for polydisperse and monodisperse aerosols (20-1000 nm) at two different face velocities (5.5 and 16.5 cm s−1) and compared with the penetration levels for N95 respirator filter media. The results showed that cloth masks and other fabric materials tested in the study had 40-90% instantaneous penetration levels against polydisperse NaCl aerosols employed in the National Institute for Occupational Safety and Health particulate respirator test protocol at 5.5 cm s−1. Similarly, varying levels of penetrations (9-98%) were obtained for different size monodisperse NaCl aerosol particles in the 20-1000 nm range. The penetration levels of these fabric materials against both polydisperse and monodisperse aerosols were much higher than the penetrations for the control N95 respirator filter media. At 16.5 cm s−1 face velocity, monodisperse aerosol penetrations slightly increased, while polydisperse aerosol penetrations showed no significant effect except one fabric mask with an increase. Results obtained in the study show that common fabric materials may provide marginal protection against nanoparticles including those in the size ranges of virus-containing particles in exhaled breath. academic.oup.com/annweh/article/54/7/789/202744
There is no shortage of KN95 masks. there are pallets of all over downtown Los Angeles.
Literally not one person wears that mask outside of these “tests”. It also has to be perfectly fit which is impossible unless you are constantly touching it which is a big no no. I swear ima have to start doing tests myself just to prove how inaccurate this is.
So your telling me we have anime aura at all times?
What is this showing hot air or breath droplets ?
Schlieren effect, hot air, but it could carry aerosol.
th-cam.com/video/doxDOlwEblg/w-d-xo.html
Thanks so much for sharing this. The use of masks and protection can change many things in the world considering that the GDP of many countries is deteriorating very quickly and the mask may become an alternative to the lockdown.
So if I'm wearing a mask and standing in front of the guy who isn't wearing one, I can still get sick because his germs can still sneak inside of my mask like the movie Alien right?
I have few queries,
what we see here are they vapours?
Droplets might not necessarily as hot as this vapours so are the droplets actually being captured in this method?
The size of droplets must be very small and the spread may be large, in that case is the resolution enough?
A coughing/sneezing person will jet droplets at higher rate , in that case is the framing rate enough?
Please ignore if you feel this questions are not relevant and pardon my foolishness
Just look at the image and you can clearly see the way it travels without a mask and with a mask on. Any prevention to reduce the risk is worth it.
so you recorded human khi so dragon ball was right .
what if this guy was holding his breathe...
StrongManMattt he wasn’t, you can see at 0:04 and 0:06 that he is breathing out, it just doesn’t go nearly as far.
this guy is about to release his stand ngl
отличная иллюстрация
Is this a thermal camera? How does this prove that masks are preventing covid? Heat and particles are completely different things.
if it would be an thermal camera HE would be red and yellow
its a background-oriented Schlieren setup (BOS), using a "regular" CCD/CMOS camera and a textured background. The rest is image processing, looking at small displacements of the background image caused by changes of index of refraction in the media between camera and background pattern
They got to turn this into a filter✔️
how do i show it on my blog
clicjk share to get the shareable link.
I've awaken Susanoo.
What kind of mask is he wearing?
Why does this not show the guy in the mask coughing like the when he does it into his arm?????
Anyone from daily dose of internet
Was this in a controlled environment with zero ambient air flow? If so it’s an unrealistic setting. Of course waves propagate long distances when there’s nothing to dampen them.its why a tsunami in japan can make it to California coast. But normal air environments have ambient flow which dampens waves. It’s why you don’t smell people’s breath unless really upclose.
Czyli nic ta maseczka nie daje. Z filmu nie wynika nic.
Is anyone else imagining that this is his aura?
Why it looks like the human Body is difussing to the sourrondings?
Because it's a visualization of the heat sources. The breath that the person is breathing out is higher temperature than the surrounding air, so it is nicely visualized. The human body is also emitting heat into its surrounding air by heat conduction, so it is also emanating heat, which when visualized here, looks like it's like melting into the air.
Works just as good as a fart going through two sets of clothing
Kiryu brawler heat mode
Masks protect others and yourself.
Mainly protects others & reduces (not stops) risk to self.
Great. Now show the cough or a sneeze in the mask
Look at the right side.
0:05 😷💨
wow!
MIT study says otherwise to surgical and n95 masks.
this is just showing CO2 isnt it?
I like how he didn’t cough in the mask at all…..
He did 0:07
You can clearly see the mask move from the cough
Hi, sorry to nit pick, but why did you compare someone coughing without a mask to someone NOT coughing with a mask? btw, I want to be able to show my friends who believe in the conspiracy, but after so many years I know the questions they'll ask. This does not help prove anything
100th comment, this is crazy
Bruh looks at that man nen
This aged well. Remember to report this video for disinformation.
PLOT TWIST: The man on the right is holding his breathe
(I believe the masks work, this is a joke for anyone who can't figure that out)
Если судить по этому видео, то маска очень мало ограничивает распространение вируса(
Not convincing as obvously the numan to human contact energetically and otherwise far exceeds any ability we may conceive of to mitigate it. LESSON: Stay healthy and adapt to whatever lurks in the environment.
We all gonna die.
Sound?
For what?
@@wugu42 For Sound O_o?
JoJo
Велосипед изобрели
Even watching this is triggering my claustrophobia. I HATE masks! They make me feel like I'm suffocating.
So try Covid-19, you will suffocating for real!
(Y)
Seems like it's just heat lol
Different
All this is doing is showing where the warm air is. THAT'S ALL!! This is FALSE!!
I’d like to see his whole head, I bet he has jets of air that shoot out the sides of the mask.
Umm no it doesnt the air goes through the mask and the virus particles get stuck in the mask
yeahhhh not even a scientific demonstration lmao not even going to explain how this is a useless example
🐑🐑🐑🐑🐑🐑🐑🐑🐑🐑🐑🐑
guy on the right doesn't cough it's not fair
Yeah he does, watch the video next time before commenting.
@@Baalaaxayeah thanks, next time don't give advice if nobody asks you
@@blagovdaryu you just did.
@@Matt_Fields_29 I didn't cough
He is coughing at the beginning at around 0:06