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Many people's understanding of masks may only stay at the level of knowing, and the in-depth understanding is almost negligible. Today, Xiaobian will take you to thoroughly understand what a mask is. Generally, masks are classified according to their use, such as decoration, cold protection, dust prevention, etc. Here, we first propose a classification method according to the principle. You can't stop breathing until half a minute. Therefore, since the breath cannot be stopped, the effect of adding a hood in front of the mouth and nose is clear at a glance. The main purpose of this kind of mask is to protect the breath from the mouth and nose, that is, the main pollutants are inside the human body; the second type is to protect the inhalation, that is, the main pollutants (or stimulating factors) are outside the human body (in the surrounding environment). Of course, many masks can not only protect the impact of harmful substances inside the human body on the outside world, but also protect the impact of pollutants in the environment on the human body. However, for the sake of simplicity, they are temporarily divided into the above two categories.
