New research has shown that wearing a mask is effective in stopping the virus from spreading through droplets

masks are now considered an effective way to prevent the spread of the new coronavirus. A new study published recently in the American journal Science Advances shows video evidence that wearing a mask can effectively block the spread of the virus through droplets, with N95 masks without breath valves protecting best.
researchers from Duke University in the United States found that the mask that blocks droplets best is the breathless valve N95 mask commonly used by front-line medical personnel. In addition, surgical masks and polypropylene medical protective masks have also shown good results. Handcrafted cotton masks can also effectively block droplets from everyday speech, but headscarves and necks do not block droplets well.
used laser transmitters, cylindrical lenses, cell phone cameras and cartons to form an improvised test device. The tester said the same thing to the cross-section of the laser beam formed in the carton without wearing a mask and wearing a mask mask, and the droplets that were produced by the speech and sprayed through the mask (in the case of a mask) were shown as flashing spots of light under laser exposure and recorded by the mobile phone camera. The researchers then calculated and analyzed the number of these small dots of light. Images show that wearing an N95 mask has the fewest recorded spots of light, i.e. the fewest droplets are sprayed.
researcher Martin Fischer said the low-cost improvised test device was developed in the hope that other researchers could use these easily available components to test various mask materials, among other things, to find the best protective masks.
the study also showed that, in addition to sneezing and coughing, droplets squirted even when people spoke every day, causing the virus to spread, the researchers said. In the current outbreak of new crowns, effective vaccines and drugs to treat new crowns have not yet been available, and wearing masks has proven to be an easy and effective way to protect against them. If everyone wears a mask, 99% of the droplets can be blocked. (Source: Xinhua News Agency, peng