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Videos show why masks with exhalation valves don’t slow COVID-19 spread

Videos show why masks with exhalation valves don’t slow COVID-19 spread

Science
Nov. 10 (UPI) -- Masks with exhalation valves don't help slow the spread of COVID-19, according to new videos captured using the schlieren imaging system and a technique called light-scattering. Masks aren't so much a tool of self-preservation and individual protection as they are a social project. Their effectiveness relies on community-wide adoption and their benefits are shared. Advertisement Studies have shown that any one mask is only partially effective at blocking virus particles, but there is a synergistic effect when multiple people wear masks. However, new research published Tuesday in the journal Physics of Fluids suggests that synergy is undermined -- and the project to slow COVID-19 transmission through mask-wearing jeopardized -- when people sport masks with exhalation valve...