Experts show which face masks offer best protection from COVID-19
Not all masks offer equal protect to slow the spread of the coronavirus. To demonstrate how different each mask is -- a homemade mask, a bandanna -- researchers created a visual simulation.
these researchers were not trying to create the perfect model of droplet Marisol. Spread through masks, they really set out to create a practical and visual demonstration of the performance off three different masks, a mask made of a folded handkerchief. Ah, home made mask made of two layers of cotton and fabric and a simple dome mask. Have a look. Using a mannequin head and fog maker to create a visible aerosol highlighted by a green laser, the researchers created a simulated cough. Ah, light cough without any face covering spreads the aerosol mist a short distance, but a simulated heavy coughed without a face covering expelled aerosol three feet away within two seconds and six feet away by 11 seconds. They also showed the effect a light breeze had on the aerosol spread. While the breeze does disperse the aerosol, it moves the particles down wind now, looking at the spread of the air, assault with a folded handkerchief or bandanna to block it, you can see that it leaks a significant amount of air assault through the mask face and at the top edge, using a home made stitched fabric mask with a simulated cough, found a much better reduction in the amount of aerosol spread into the air. The spray doesn't go much beyond three inches from the mannequin face, but there is still leakage at the top of the mask now. Finally, the researchers used in off the shelf cone type mask. It's important to point out that although it has the same shape as some N 95 respirators, this is not an N 95 respirator now. Interestingly, the amount of aerosol that penetrates the front of the mask travels farther than the aerosol from the hand sewn mask, and again there is leakage from the top of the mask.