Obviously, even if you think you don't spit when you speak. This is a new video highlight that spits with a laser. Posted in Video New England Journal of Medicine, Showing how particle ejections are emitted when someone says to “keep healthy” at various volumes. Then, when the same person covered his mouth with a wet towel and said “to stay healthy,” he showed how the particle volume changed.
Other visualizations, like videos, are a great way to understand what's always flying out of your mouth, not just when you cough or sneeze. This respiratory discharge is one of the ways experts think about the new corona virus spread. However, depending on how you make it, this type of demonstration can be misleading and give people a false sense of security.
Alex Huffman, associate professor of aerosol research at the University of Denver's Department of Chemistry and Biochemistry, said laser beams are a common technique for visualizing and calculating droplets in the air. Huffman said he wasn't involved in this video, but that this demo using this technique is a useful way to show that you can just sting just by speaking.
“When you speak, you see things coming out of your mouth and you get less when you stick something in front of your face,” he says.
That is the goal of the Centers for Disease Control and Prevention. When going out in public, everyone should wear a temporary face cover. People can spread the new coronavirus without being sick. If they pull something out of their mouth, they may not release a lot of viruses when they speak or breathe. Even a little less risk of spreading the virus to others.
However, visualization is as beneficial as the composition of the parameters. that much NEJM The laser in the video only captured particles between 20 and 500 micrometers (human hair width is about 75 micrometers). People also produce particles much smaller than when they talk and breathe, and small particles can continue to carry microscopic worms, including new corona viruses.
“Relatively simplistic, visualizations that only look at large objects or emphasize large objects mean that most objects are stopped.
Also, particles under 20 micrometers behave differently than large particles. “These droplets seem to take longer in the air and are far more likely than those shown here,” said Lindsey Marr, professor of civil and environmental engineering, who studies the transmission of viruses in Virginia Tech's aerosols. e-mail.
that much NEJM The video was produced by researchers at the National Institute of Diabetes and Digestive and Kidney Disease, mentioned in a statement that this is only an observation, not a traditional experiment. They said they are working on new research to help characterize droplet behavior at various sizes. "This can help us understand how to mitigate the spread of COVID-19 and potentially other viruses."
Huffman said that demonstrations that do not include everything that people can sow when talking are still useful, Huffman said. However, they worry that they can provide the wrong sense of safety and give the impression that covering their mouth will stop most personal discharges. In fact, most of the fabrics that people can use to make temporary masks like cotton t-shirt fabrics filter out only a few. Its small amount is better than nothing and can interfere with the transmission of something like COVID-19, but it is not an impenetrable wall.
So a video like this is just the starting position. “We emphasize the principles and then dig layers to get more information. "But it doesn't solve everything like the mask itself."