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The British newspaper quoted Dr. Jinxiang Shi, a co-author of the study, as saying: "The study showed the error of the prevailing belief that wearing a muzzle, whether new or used, is better than not wearing it to avoid the crown.".
Jinxiang added that three-layer masks are the best for preventing corona infection, explaining it by saying: "The inner layer is made of absorbent material, the middle layers act as a filter, while the last layer is made of non-absorbent material.".
And in the study, the results of which were published in a journal "Fluid physics"The researchers developed a computer model of a person wearing a three-layer medical mask and tracked the movement of liquid droplets and small particles that could land on the mask and face, and whether they had reached the nose and lungs. .
The researchers then studied the efficiency of the filter layer in the mouth, to find that it filters 65 percent of the particles in case they were new, while the percentage reaches 25 percent after using them.
The researchers attributed the results of their study to a change in the shape of the muzzle after use, which affects airflow patterns and reduces its effectiveness.
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According to the researchers, wearing a previously worn muzzle may be less effective for protection in “Covid-19”, compared to not wearing it at all.
And masks such as those used in surgical operations and consisting of three layers, which are used once before their removal, were tested, as the researchers found that they are capable of filtering approximately three-quarters of the fine particles suspended in the air, which are mainly responsible for the infection, when they are new. .
And if these masks are used more than once, they filter a quarter of those particles, due to their corrosion, according to the British newspaper “Daily Mail”.
The British newspaper quoted study co-author Dr. Jinxiang Shi as saying: “The study showed the error of the prevailing belief that wearing a muzzle, whether new or used, is better than not wearing it to avoid the crown.”
Jinxiang added that three-layer masks are the best to prevent corona infection, explaining it by saying, “The inner layer is made of absorbent material and the middle layers act as a filter, while the last layer is made of an absorbent material. non-absorbent material “.
In the study, the results of which were published in the Journal of Fluid Physics, the researchers developed a computer model of a person wearing a three-layer medical mask and tracked the movement of liquid droplets and small particles that could fall on the surface. mask and face, and if they had reached the nose and lungs.
The researchers then studied the efficiency of the filter layer in the mouth, to find that it filters 65 percent of the particles in case they were new, while the percentage reaches 25 percent after using them.
The researchers attributed the results of their study to a change in the shape of the muzzle after use, which affects airflow patterns and reduces its effectiveness.
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