Compare the airflow with and without a mask. Will you still wear a mask after reading it?

Recently, the topic of air flow difference between wearing a mask and not wearing a mask has caused extensive discussion. As can be seen from the animation, wearing a mask can not only prevent harmful substances from entering the respiratory tract, but also avoid sneezing, coughing, and droplets ejected when talking from running into the air. Obviously, wearing a mask is not only beneficial to yourself, but also to others, not only to protect yourself, but also to others.

Off-topic, the airflow visualization shown in the animation uses schlieren imaging technology. Schlieren method is a commonly used optical method to display and measure the airflow field, which can make the invisible airflow change visible and intuitively feel the airflow disturbance. 1864, German physicist Topler first proposed this technology.

To put it bluntly, the principle is not complicated, because the regional flow of airflow changes the airflow density in this area, and the change of refractive index of light in airflow is directly proportional to the change of airflow density, so that the change of airflow density invisible to human eyes can be converted into optical information and recorded, and people can feel the change of airflow more intuitively.

Well, that's enough digression. Let's go back to the topic of whether wearing a mask has any effect. At first, when the epidemic situation abroad was not as serious as it is now, we often saw this kind of information on the Internet. Foreigners don't wear masks, thinking that those who wear masks are patients and rejecting those who wear masks. In Switzerland, another member of parliament was fired for wearing a mask to attend the meeting, but the result was to disturb the order of the meeting. Moreover, at that time, most foreign medical institutions, media and experts in related fields also advocated that healthy people did not need to wear masks, claiming that wearing masks would not hinder the spread of the virus and would easily cause panic.

As the epidemic situation abroad became more and more serious, they began to wear masks. In the final analysis, foreigners don't like wearing masks, not only because of their own historical and cultural reasons, but more importantly, foreigners didn't fully understand the spread of the virus at first.

Masks are sanitary products. Wearing a mask can effectively prevent harmful odor, gas and droplets from entering the mouth, nose and respiratory tract, and effectively reduce the probability of virus infection.