![Picture of Sakura](img/sakura.jpg)
Does everyone usually wear masks?
![Picture of Yuzuki](img/yuzuki.jpg)
Winter is good for prevention of a cold.
![Picture of Kyohei](img/kyohei.jpg)
I wonder if I can usually do it.
![Picture of Sakura](img/sakura.jpg)
Here we will look at the mask made of paper. First of all, do you think that masks can prevent pathogens of any size?
![Picture of Yuzuki](img/yuzuki.jpg)
Well, can not you prevent any pathogens?
![Picture of Sakura](img/sakura.jpg)
In a box of a certain mask, "PFE 97%" was written. PFE is "polystyrene fine particle blocking effect experiment". Simply put, it is a very small (0.1 micrometer) grain of polystyrene, which is a test to see how much grains do not pass.
![Picture of Kyohei](img/kyohei.jpg)
In other words, if you want to kill pathogens of 0.1 micrometer, 97% can block out.
![Picture of Sakura](img/sakura.jpg)
Such that.
The 0.1 micrometer is about 1 / 800th of the average hair thickness, influenza virus is about 0.08 micrometer ~ 0.12 micrometer, and it seems to be expected to some extent .
![Picture of Sakura](img/sakura.jpg)
In other words, it can be prevented from many pathogens, but it is not completely preventable.
![Picture of Sakura](img/sakura.jpg)
Also, when you put on a mask, if a gaps are formed between the mask and the face, you will be able to enter the pathogens from there. It is also important that you do not make gaps between the mask and face as much as possible.
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Let's think!
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