How a mask helps minimise COVID-19 spread

Without a mask, a turbulent jet forms (during the time of coughing or sneezing), and droplets with a broad size distribution are ejected.

Large droplets (greater than about 125 microns in diameter) fall to the ground within about 2 metres, while turbulent clouds transport a mist of small aerosolized droplets over significant distances (approximately 5 metres).

A loosely fitted simple cotton cloth mask qualitatively changes the propagation of the high velocity jet, and largely eliminates the turbulent cloud downstream of the mask.

The spread of the ejecta is also changed, with large droplets trapped at mask surface

Hope this helps! more  

This information was already circulated through different media about a month before or so. more  
What new information has been given in this post. Social distancing, wearing of mask, hand washing, etc will have to be practiced for months to come. We have to learn to live with the virus carriers around us more  
Mask or any other cover over the mouth and nose slows down breath in and breath out process since free flow of air is restricted this can lead into some other complications in the long run. more  
What about a person who is not having cold, cough or any other health issues and he maintains social distance will mask is still helpful to avoid contamination & If so how? more  
With the mask on are we not breathing in the exhaled carbon dioxide to a large extent? more  
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