B1 中級 美國腔 2074

 [INTRO MUSIC] So. How do you weigh a fart? [THEME MUSIC] Dr. Michael Levitt, who has decades of research experience in flatology, indicates that the typical daily volume output is between half a liter and 2 liters of gas once cooled to room temperature. If you pretend that the fart obeys the ideal gas law from high school chemistry class, which it probably does to a decent approximation, you could work out the mass of the fart once you know the average molecular mass of a fart particle. To get that, we need to know what gases are in a fart and what ratio they're found in. This turns out to vary a lot by person and by diet. I ballparked some average numbers from a paper in a medical journal that measured the gas mix in 10 subjects who had been fed a normal diet plus a bunch of baked beans each day. I got a density of around 1 gram per liter. Now, I'm going to assume that our intrepid astronaut has recently downed a burrito or two, and would produce 1 full liter, i.e. 1 gram worth of fart mass over a 24 hour period. For a per fart analysis, assuming a typical 10 to 20 individual farts over the same period, you would get somewhere between 0.05 and 0.1 grams of mass per fart. That number may be off by a factor of two or so, but I doubt it's off by a factor of 10. And that's how you weigh a fart. [THEME MUSIC]

# 怎麼去測量你的屁的質量？

2074
Derrick Chen 發佈於 2015 年 5 月 27 日    Derrick Chen 翻譯    王妍心 審核

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