The specific steps are as follows:
1, before wearing a mask, distinguish between its positive and negative.
2. The side of the mask with metal strips is the top.
3, the middle three layers of downward masks are outside.
4. The light color is inside.
5. Hang the strap of the mask on the ear.
6. Gently press both sides of the alar by hand to make the metal strip conform to the shape of the alar.
7. Pull the mask down and cover your chin.
8, wearing is complete.
Extended data:
How long does the mask last?
From the point of view of human physiological structure, because the blood circulation of nasal mucosa is very strong and the passages in nasal cavity are very tortuous, nasal hair constitutes a "barrier" for filtration.
When air is inhaled into the nostrils, the airflow forms a vortex in the tortuous passage, which warms the airflow inhaled into the nasal cavity. Some tests show that when cold air at minus 7℃ is inhaled into the lungs through the nasal cavity, its airflow has been heated to 28.8℃, which is very close to the temperature of the human body.
If you wear a mask for a long time, it will make the nasal mucosa fragile and lose the original physiological function of the nasal cavity, so you can't wear a mask for a long time. Masks can only be worn in special environments, such as places with many people and poor ventilation. Of course, it is necessary to wear a mask when walking in the wild, in order to resist wind, sand and cold, or to move in an environment with air pollution, but the time should not be too long.
In addition, in the flu season, you should wear a mask when you go to public places where there may be a lot of pathogenic bacteria. Wearing a mask is only one of the ways to prevent respiratory infectious diseases, and the most important thing is to maintain good living habits.
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