A range of face masks could all potentially help reduce Covid-19 transmission, a study shows. The distance and direction travelled by air expelled when a person breathes or coughs when wearing different face coverings was measured by a team led by engineers at the University of Edinburgh, using a technique called Background Oriented Schlieren imaging. Measurements were taken from people wearing different face coverings while standing or lying down, and from a manikin connected to a cough-simulating machine. Researchers found that all face coverings without an outlet valve reduce the forward distance travelled by a deep breath out by at...
See this recent article published in the BMJ April 9th 2020 following research conducted at Cambridge University. The conclusion - everyone should wear a Face Mask. https://www.cam.ac.uk/research/news/everyone-should-wear-masks-in-covid-19-crisis-say-cambridge-researchers
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