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How much does a fart weigh?


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Last night I was experimenting with the scale a little(I posted about it in the motivation forum...running in the rain thread)  and when I first stepped on the scale it read 168.6  That was expected because I was still wearing water logged clothes from running in the rain.  To double check(my husband and I were betting, so I had to be sure!) I weighed myself again....166.4!!!!  The only thing that happened between the first and second weighin was a big fart!  Can a fart really weigh 2.2 lbs or is my scale just very innacurate?  Has anyone else weighed a fart before?  Haha...I can't wait to see responses...

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Original Post by smartjock256:

Aight, I'm about to go total nerd on you here, and, since this is the internet, there's not a thing you can do.

From the typical composition of farts from wikipedia, the average molecular weight of a fart is about 25.6. So, for 2.2 lbs, that's would come out to .086 lb-mols of fart. Lets say pressure inside the gut is 1.1 atm (I don't know for sure, but I think that's reasonable. And temperture is body temperature, 98.6 deg F, or about 560 deg R (degrees Rankine, an absolute temperature scale, like Kelvins, but English unit).

Using PV = nRT, where R is the ideal gas constant, R=.7302 ft^3 *atm/degR/lb-mol

V=nRT/P=(.086)(.7302)(560)/(1.1)=~32 cubic feet. That's a lot of volume, and is substantionally large than the volume of an average human (actually probably just about any human). Let's say a 6 ft tall individual has a waist circumfrance of 40 inches, and is a cylinder (obviously not true, since the shouldars are larger and legs smaller, but enough to get the idea accross, and probably an overestimate), would be about 2 cubic feet.

 Damn...thanks for doing the leg work!  I guess it's time for a new scale!

Sharting would be a whole new theory and, as solid mass would be expelled, obviously one could most certainly weigh less afterward.  Depending of course on the mass of said shart and the ability of one's scale to measure to a more finite degree.

My scale only measures to 10th's, so if said shart was small in mass, it would most likely not register as a loss.
methane has no smell.

so there must be poo particles along with the methane.

so really when someone farts, the particles came from their butt to your nose to enable you to smell it.

you could weigh the underwear before and after sharting on a more sensitive scale.
Frothy, my DH has the same theory.  He calls them "farticles" though. 
Original Post by frothbeast:

methane has no smell.

so there must be poo particles along with the methane.

so really when someone farts, the particles came from thier butt to your nose to enable you to smell it.

you could weigh the underwear before and after sharting on a more sensitive scale.

for clarrification it wasnt a shart!  

 yuck...that is far to nasty to experiment with...I think I am satisfied to say my scale sucks...haha!

It's not just a theory Kallie, When I fart in chat, the poo dust comes from my butt and into your nose.

*lifts a cheek and strains a little*
Careful Frothy don't...EEEWWW!!

I am so not cleaning THAT up!

poo dust!!! LOL
Fortunately I am waering my diaper today!

The fart wouldn't act as an ideal gas inside the body.

I have never heard anyone describe a fart as 'Ideal' before
Original Post by frothbeast:

I have never heard anyone describe a fart as 'Ideal' before

I dunno froth... sometimes I feel soooo much better after I let one rip.

Is constantly reminded of The Nutty Professor when reading this thread.

*FARRRRT*

"Hercules!  Hercules!"

Oh come on Frothy..well, maybe not describe it as ideal.

But if we are all honest...we've had the "ideal" fart. Like when you really, really need to and manage to, without sharting, and thus release the pressure in your gut.

Or when you are somewhere public so the fart needs to be quiet and odorless and both things actually happen...that is ideal.
I guess when you put it that way,

My ideal fart would seem like I sharted, and gave me an adrenaline rush, but upon checking it out,  would be squeaky clean!
Original Post by frothbeast:

I have never heard anyone describe a fart as 'Ideal' before

 Sometimes it can make you feel a lot better.

^5's Younts. 

I see you know what I mean by "ideal"!
Original Post by kallie67:

Oh come on Frothy..well, maybe not describe it as ideal.

But if we are all honest...we've had the "ideal" fart. Like when you really, really need to and manage to, without sharting, and thus release the pressure in your gut.

Or when you are somewhere public so the fart needs to be quiet and odorless and both things actually happen...that is ideal.

 For me its when I'm running.  I will get lots of lower abdomin pain and know its coming.  I wait till my DH and I aren't around anyone else and then I will say "hey, Jeremy!" and let it out.  After about a year of marriage and this sort of behavior he still gets a great look of horror on his face, even though he can't smell, because its so loud!

Wait until you get to the 10 year mark!  DH can just look at my face now and he quickly moves away.  He knows what's coming.

And, I had to last night while we were walking the dog, but this other couple that walks their dog with us sometimes comes up and the dogs are playing about, so I had to hold it in.  DH was laughing 'cause he knew.

So I let it out as soon as we got in the car.  Serves him right for laughing at me.

Back in middle school, I learned very early not to cough when you are trying to hold in gas...

Or to clench too tightly, thus, if the gas does escape, you make the air be letting out of a pinched ballon sound.

*baffled by how long this dicussion has gone on and how far it's progressed, but it's fun on a Friday!*
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