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Respected Contributor
Posts: 2,813
Registered: ‎01-14-2017

covid video demonstration of how droplets travel with/without masks

[ Edited ]

hi @hckynut A link to a video with a simulation of how a substance similar in weight to covid droplets travel and become suspended with and without a mask that I previously posted was from tube and the web page apparently had links that someone found objectionable and was removed.  I hope this new link to the health content that you wanted to see is not removed.  It is from the Today show.  If it is removed, you can google yourself for video of droplets traveling with and without a mask.  In response to the question in your other post, all the simulations are of people at rest, so, as you mentioned, if someone was exerting themselves when expelling the droplets, the spray may be larger. 

 

 

 

The video simulates coughing, but the virus also spreads from speaking and singing.  The more vigorous the singing, or the louder the talk, presumably it would be similar to a cough. 

 

Hope you find it helpful.

 

edited to remove link that contained political links

Respected Contributor
Posts: 2,813
Registered: ‎01-14-2017

Re: covid video demonstration of how droplets travel with/without masks

I just wanted to be clear that I just posted a link to a video from the Today show.  I am guessing the web pages contain election campaign ads that are triggering the removal of the links.  I was not posting links to political content, but I have seen many web pages with campaign ads.

Honored Contributor
Posts: 23,628
Registered: ‎05-22-2016

Re: covid video demonstration of how droplets travel with/without masks

If you can imagine a person filled with smoke, endless smoke, and whenever they would breathe, talk, sneeze, cough or sing then you'd be able to see it coming out of their mouth and nose. The louder or faster they do that then the more smoke would come out. That's how the virus acts...it's like smoke but invisible.

Esteemed Contributor
Posts: 7,387
Registered: ‎03-10-2010

Re: covid video demonstration of how droplets travel with/without masks

[ Edited ]

@SilleeMee wrote:

If you can imagine a person filled with smoke, endless smoke, and whenever they would breathe, talk, sneeze, cough or sing then you'd be able to see it coming out of their mouth and nose. The louder or faster they do that then the more smoke would come out. That's how the virus acts...it's like smoke but invisible.


@SilleeMee  The entire concept of "coming out of their mouth and nose" is why masks are essential! We protect others from 'us'.

Respected Contributor
Posts: 3,942
Registered: ‎03-16-2010

Re: covid video demonstration of how droplets travel with/without masks

Thanks @NYCLatinaLaw for the video.

 

I will post one that I have posted before published in the New England Journal of Medicine.  If you click on the black square it demonstrates particle emission while saying the words "stay healthy" at various levels with and without a mask.  It is obvious that particles do emit and transfer and that wearing a mask reduces emission.

 

https://www.nejm.org/doi/full/10.1056/NEJMc2007800 


* Freedom has a taste the protected will never know *
Esteemed Contributor
Posts: 7,359
Registered: ‎03-09-2010

Re: covid video demonstration of how droplets travel with/without masks


@SilleeMee wrote:

If you can imagine a person filled with smoke, endless smoke, and whenever they would breathe, talk, sneeze, cough or sing then you'd be able to see it coming out of their mouth and nose. The louder or faster they do that then the more smoke would come out. That's how the virus acts...it's like smoke but invisible.


That's a good explanation!

 

Esteemed Contributor
Posts: 7,115
Registered: ‎02-19-2014

Re: covid video demonstration of how droplets travel with/without masks

"We found that when the person said “stay healthy,” numerous droplets ranging from 20 to 500 μm were generated. These droplets produced flashes as they passed through the light sheet (Figure 1). The brightness of the flashes reflected the size of the particles and the fraction of time they were present in a single 16.7-msec frame of the video. The number of flashes in a single frame of the video was highest when the “th” sound in the word “healthy” was pronounced (Figure 1A).

 

Repetition of the same phrase three times, with short pauses in between the phrases, produced a similar pattern of generated particles, with peak numbers of flashes as high as 347 with the loudest speech and as low as 227 when the loudness was slightly decreased over the three trials (see the top trace in Figure 1A). When the same phrase was uttered three times through a slightly damp washcloth over the speaker’s mouth, the flash count remained close to the background level (mean, 0.1 flashes); this showed a decrease in the number of forward-moving droplets (see the bottom trace in Figure 1A).

 

We found that the number of flashes increased with the loudness of speech; this finding was consistent with previous observations by other investigators.3 In one study, droplets emitted during speech were smaller than those emitted during coughing or sneezing. Some studies have shown that the number of droplets produced by speaking is similar to the number produced by coughing.4"

When you’re accustomed to privilege, equality feels like oppression.
"Power without love is reckless and abusive, and love without power is sentimental and anemic." - Dr. Martin Luther King Jr
Esteemed Contributor
Posts: 7,387
Registered: ‎03-10-2010

Re: covid video demonstration of how droplets travel with/without masks


@CelticCrafter wrote:

@SilleeMee wrote:

If you can imagine a person filled with smoke, endless smoke, and whenever they would breathe, talk, sneeze, cough or sing then you'd be able to see it coming out of their mouth and nose. The louder or faster they do that then the more smoke would come out. That's how the virus acts...it's like smoke but invisible.


That's a good explanation!

 


@CelticCrafter Tthis is pretty much the problem with health clubs opening up- mine has, with following guidelines even more than is required (they're part of a hospital). I'm hesitant to go back, quite honestly. Although this covid waistline of mine needs to go! Woman LOL

Esteemed Contributor
Posts: 7,387
Registered: ‎03-10-2010

Re: covid video demonstration of how droplets travel with/without masks


@Porcelain wrote:

"We found that when the person said “stay healthy,” numerous droplets ranging from 20 to 500 μm were generated. These droplets produced flashes as they passed through the light sheet (Figure 1). The brightness of the flashes reflected the size of the particles and the fraction of time they were present in a single 16.7-msec frame of the video. The number of flashes in a single frame of the video was highest when the “th” sound in the word “healthy” was pronounced (Figure 1A).

 

Repetition of the same phrase three times, with short pauses in between the phrases, produced a similar pattern of generated particles, with peak numbers of flashes as high as 347 with the loudest speech and as low as 227 when the loudness was slightly decreased over the three trials (see the top trace in Figure 1A). When the same phrase was uttered three times through a slightly damp washcloth over the speaker’s mouth, the flash count remained close to the background level (mean, 0.1 flashes); this showed a decrease in the number of forward-moving droplets (see the bottom trace in Figure 1A).

 

We found that the number of flashes increased with the loudness of speech; this finding was consistent with previous observations by other investigators.3 In one study, droplets emitted during speech were smaller than those emitted during coughing or sneezing. Some studies have shown that the number of droplets produced by speaking is similar to the number produced by coughing.4"


@Porcelain  where's is this copy/paste from?

Esteemed Contributor
Posts: 7,115
Registered: ‎02-19-2014

Re: covid video demonstration of how droplets travel with/without masks


@ibb38 wrote:

@Porcelain wrote:

"We found that when the person said “stay healthy,” numerous droplets ranging from 20 to 500 μm were generated. These droplets produced flashes as they passed through the light sheet (Figure 1). The brightness of the flashes reflected the size of the particles and the fraction of time they were present in a single 16.7-msec frame of the video. The number of flashes in a single frame of the video was highest when the “th” sound in the word “healthy” was pronounced (Figure 1A).

 

Repetition of the same phrase three times, with short pauses in between the phrases, produced a similar pattern of generated particles, with peak numbers of flashes as high as 347 with the loudest speech and as low as 227 when the loudness was slightly decreased over the three trials (see the top trace in Figure 1A). When the same phrase was uttered three times through a slightly damp washcloth over the speaker’s mouth, the flash count remained close to the background level (mean, 0.1 flashes); this showed a decrease in the number of forward-moving droplets (see the bottom trace in Figure 1A).

 

We found that the number of flashes increased with the loudness of speech; this finding was consistent with previous observations by other investigators.3 In one study, droplets emitted during speech were smaller than those emitted during coughing or sneezing. Some studies have shown that the number of droplets produced by speaking is similar to the number produced by coughing.4"


@Porcelain  where's is this copy/paste from?


It's from @pitdakota's study she linked to.

When you’re accustomed to privilege, equality feels like oppression.
"Power without love is reckless and abusive, and love without power is sentimental and anemic." - Dr. Martin Luther King Jr