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屁大点事有多大

How to Weigh a Fart | Space Time | PBS Digital Studios

[出场音乐]
[INTRO MUSIC]
那么
So.
你会怎样称一个屁的重量?
How do you weigh a fart?
主题音乐
[THEME MUSIC]
迈克尔莱威特博士,用了几十年的时间来
Dr. Michael Levitt, who has decades
研究胃胀气的原理
of research experience in flatology,
研究显示,人的每日一般排气量
indicates that the typical daily volume
在半升到2升之间
output is between half a liter and 2 liters
这是当气体冷却到室温时的体积
of gas once cooled to room temperature.
如果假设屁遵循高中化学课上学到的
If you pretend that the fart obeys the ideal gas
理想气体原理,这也许
law from high school chemistry class, which it probably
算是个合理的近似吧,
does to a decent approximation, you
只要你知道每个屁粒子的重量时
could work out the mass of the fart
你就可以计算出整个屁的
once you know the average molecular mass
重量了
of a fart particle.
要得到平均分子质量,我们需要知道屁里面有什么气体
To get that, we need to know what gases are in a fart
以及它们之间的比例
and what ratio they’re found in.
但每人吃的不同屁粒子的类型也不同
This turns out to vary a lot by person and by diet.
我从某医学杂志上的论文上看到一些平均数
I ballparked some average numbers from a paper
上面说到了测量这种
in a medical journal that measured the gas
混合了10种物质的气体
mix in 10 subjects who had been fed
每天正常的饮食加上一把烤豆就能产生这样的气体
a normal diet plus a bunch of baked beans each day.
气体密度大约是一克每升
I got a density of around 1 gram per liter.
现在,我将假设我们勇敢的宇航员
Now, I’m going to assume that our intrepid astronaut has
最近吃下一到两个玉米煎饼
recently downed a burrito or two,
就会产生满满一升的气体
and would produce 1 full liter, i.e.
质量为一克的屁产生周期要在24小时之上
1 gram worth of fart mass over a 24 hour period.
分析一下每一个屁,假设在这段时期产生了
For a per fart analysis, assuming a typical 10
10到20个屁
to 20 individual farts over the same period,
你会得到,每个屁的质量是0.05
you would get somewhere between 0.05
到0.1克
and 0.1 grams of mass per fart.
这个数字的误差可能会是两倍左右
That number may be off by a factor of two or so,
但我怀疑它有10倍之多
but I doubt it’s off by a factor of 10.
所以,这就是称出一个屁质量的方法
And that’s how you weigh a fart.
[主题音乐]
[THEME MUSIC]

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视频来源

https://www.youtube.com/watch?v=3t0lRt329wM

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