In today's increasingly smog, many people's attention to air quality has been significantly improved. Whether indoor dust is composed of skin, today, Farakadan answers you.
"Sherlock: The Abominable Bride"
Xiao Bian was watching this movie when he watched the movie "Sherlock: The Abominable Bride": Moriarty stood by the fireplace and asked: "Do you know that dust is mainly composed of human skin?" Sherlock answered without hesitation: "Know." Xiaobian suddenly felt surprised, how can I not even know this, too ignorant!
But is this true or false? Xiaobian can't be fooled by movies like this. After all, some movie plots rely on imagination. . .
We might as well estimate that according to the average person's skin metabolism rate, an adult will produce about 2 grams of dead skin a day, which means that the often-frozen Fusang and peanut butter at home can contribute to the small home of 221B on Baker Street every year. 1.5 kilograms of skin debris, and this man seems to dislike others to clean his room, so the skin of his family should occupy a large proportion of the dust.
If we go online to search for keywords like "dandruff", it is not difficult to find that there are many materials that mention "80% of indoor dust is skin". It seems that Mo Niangniang and Fusang Sang really I don’t want to bully.
For example, on a certain domestic encyclopedia website, it is mentioned that "80% of the dust is dander".
Eh? and many more. It seems a bit too wrong to think about it.
Although the total amount of dander is not small, most of them will go directly into the sewers along with the process of bathing or washing. It is important to know that even in the Victorian era in the dream of the dream, soap has already achieved industrial production. A well-dressed gentleman like Fu Fu has a material and cultural reason to carefully handle his personal hygiene problems.
What's more, in the unwashed house, in addition to dandruff, fungal spores, dirt particles and arthropod fragments and excreta are also not rare in the dust. It seems that the amount of human skin contained in the dust of Mo Niangniang is still open to question.
What kind of ingredients do you have in the dust that you are licking? Image source: movie screenshot
Looking back at this urban legend that "80% of indoor dust is skin", the literature on this statement almost invariably invokes a 1974 research paper.
However, if you take a closer look at this ancient paper, you will find that it does not mention the so-called "the eighty component of dust is human skin". The most original description is "almost 80% of indoor suspended particles in rural areas." Contains protein".
"Dust is mainly composed of human skin" rumors of the earliest data sources.
Obviously, the inclusion of protein does not mean human skin, and even particles containing human skin do not necessarily consist entirely of human skin. The so-called "80% dust is the skin" may be just a lesser interpretation of future generations.
The paper then stated that the dust collected in the air appears to be "mostly composed of some skin-like particles" under the microscope, as for these "similar The granules of the skin are not the skin. How much of this is the majority, I am afraid that the technology of the 1970s can answer.
Under the electron microscope, "skin-like particles," seems indeed smell of human skin, Ga bang crisp it.
But not so, in almost the same age with the paper, there are some other studies using different methods to estimate the proportion of skin debris dust, and their results are a far cry from the paper, and even the original authors of other studies also No exception – by analyzing the proportion of skin in the dust by analyzing the content of certain “skin-characteristic substancesâ€, he concluded that the skin composition only accounts for 0.4% to 0.8% of the total weight of air-suspended particles.
From this point of view, the truth of the facts is nothing more than the ecstasy of Mo Niangniang and Juanfu who believe in others, and the fact that the legend of the city has been brought to the Victorian era by the dream of Huang Fu, who is a blessing.
Of course, in the final analysis, McGonagall listened to the hearsay...
With the deepening of research, people gradually discovered that the composition of "dust" is closely related to the location, time and even the collection method. The composition is complex and variable, and it is unlikely to use a universal "large" Partially composed of XX". So by the 1980s no one had tried to analyze the "universal composition of dust."
Hey, wait. Perhaps after years of love and death, Mo Niangniang is familiar with the Fufu (a) to the dust of his family.
To answer this question, we must first determine if there is an environment where most of the dust comes from human skin. Not to mention, this is really found by modern scientists, that is, the school's gymnasium, although the skin content is not as exaggerated as 80%, but at least it should taste fresh human skin. Of course, the work of scientists has nothing to do with Mo Niang. Their purpose is to study the impact of school gymnasium on epidemics (you are not sure to play basketball by the way?).
The reason why the school gymnasium has such a high proportion of skin debris is that it is because of the large number of people, the high degree of skin exposure and the frequent collision and friction with each other. Perhaps, Mo Niangni is not convinced of rumors, he just knows more about what kind of sports he likes at home.
What kind of exercise is it? Hey... Image source: TV show screenshot.
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