A sick person’s cough may contain two hundred million virus particles
Products that kill at 99.9% are not sufficient for disinfection (1 in 1000 virus survive)
Our barrier residue stays active for up to 30 days
Believe it or not, there are scientists who spend their days studying how we cough and sneeze.
Actually, this is not so weird, considering cough, sneeze and touch is pretty much how we spread viruses, it makes sense to understand it as best we can.
Without wanting to get too technical here, I’ll make it simple.
Now, bear in mind the scientists have used amazing setups to work all this out and have worked with 100’s of people.
In regards a cough, this starts with a deep breath followed by compression of air, which is then forced out in a fraction of a second. This air would nearly fill a 2-litre bottle of fizzy pop. These coughs force out thousands of tiny droplets. Amazingly, about 3000 every cough travelling at 50 MPH.
Sneezing is even worse. 40000 droplets at 200 MPH.
The average human cough would fill about three-quarters of a two-liter soda bottle with air — air that shoots out of the lungs in a jet several feet long. Coughs also force out thousands of tiny droplets of saliva. About 3,000 droplets are expelled in a single cough, and some of them fly out of the mouth at speeds of up to 50 miles per hour.
If a person is sick things get much worse. A single cough can emit 200 Million individual virus particles.
“What happens to these droplets depends on their size,” said fluid dynamicist Bakhtier Farouk of Drexel University in Philadelphia.
Most of the larger, heavier drops fall quickly to the floor under the influence of gravity. The smaller and lighter particles are less affected by gravity and can stay airborne almost indefinitely as they are caught up in and dispersed by the room’s airflow.
Movements in a room can cause the heavier droplets to become airborne again after they have fallen to the ground or another surface. Opening a door can dramatically alter the airflow in the room and pull up viruses on the floor. Even walking through a room can spread droplets in a person’s wake.
Once airborne, viruses in these tiny droplets can survive for hours. Even if the droplets hit a surface, the viruses can survive and still spread disease if the droplets become airborne later. When a droplet lands on paper, its virus particles can survive for hours. On steel or plastic they can survive for days.
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