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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 hmking:

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...

I have never experienced this myself, but this sure got a smile out of me first thing in the morning, despite my current migraine.  =)  Thank you!

 

Original Post by hmking:

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...

Depends whether it was a 'cargo' fart...

Original Post by auriam:

Original Post by hmking:

...

Depends whether it was a 'cargo' fart...

 Ah!  yikes!  no, it wasn't!!!

2.2 lbs of gas is a lot, especially since they're at higher temperature and therefore less dense.  Try this out... take a deep breath then weigh yourself.  Then, exhale all of the air out of your lungs and weigh yourself again.

You will most likely see no difference on the scale.  This is because there is a big difference between mass and weight.  Your mass will no doubt increase, but because you are adding something to your body that is at the same 1atm pressure as the rest of your surroundings, your weight on the scale won't.  Think about how you would "weigh" less in a pool if you took a deep breath.  Obviously, you didn't lose any mass when you took that breath.

lol i doubt it would have weighed THAT much!! made me smile :)

Original Post by yountsmonster:

2.2 lbs of gas is a lot, especially since they're at higher temperature and therefore less dense.  Try this out... take a deep breath then weigh yourself.  Then, exhale all of the air out of your lungs and weigh yourself again.

You will most likely see no difference on the scale.  This is because there is a big difference between mass and weight.  Your mass will no doubt increase, but because you are adding something to your body that is at the same 1atm pressure as the rest of your surroundings, your weight on the scale won't.  Think about how you would "weigh" less in a pool if you took a deep breath.  Obviously, you didn't lose any mass when you took that breath.

Then again, a fart is mostly methane and hydrogen, right?.. and those are LIGHTER than air.

So maybe you would weigh MORE after letting a really big one rip...

This made me laugh uncontrollably! 

I'm guessing it's the scale, for the aformentioned reasons about what gas weighs/doesn't weigh.

But I'm still gonna try this next time...welll...you know.  Purely for scientific research!
Original Post by yountsmonster:

2.2 lbs of gas is a lot, especially since they're at higher temperature and therefore less dense.  Try this out... take a deep breath then weigh yourself.  Then, exhale all of the air out of your lungs and weigh yourself again.

You will most likely see no difference on the scale.  This is because there is a big difference between mass and weight.  Your mass will no doubt increase, but because you are adding something to your body that is at the same 1atm pressure as the rest of your surroundings, your weight on the scale won't.  Think about how you would "weigh" less in a pool if you took a deep breath.  Obviously, you didn't lose any mass when you took that breath.

So your vote is for messed up scale?   

haha...I have a physics degree...I know the difference between mass and weight...but I don't know much about physiology!  my guess is normal air and human farts are very different substances!!!  I have no idea how dense a fart is.

auriam:  Yep, they are less dense.  1lb of 37 C methane would require a very large volume though.

Original Post by auriam:

Original Post by yountsmonster:

2.2 lbs of gas is a lot, especially since they're at higher temperature and therefore less dense.  Try this out... take a deep breath then weigh yourself.  Then, exhale all of the air out of your lungs and weigh yourself again.

You will most likely see no difference on the scale.  This is because there is a big difference between mass and weight.  Your mass will no doubt increase, but because you are adding something to your body that is at the same 1atm pressure as the rest of your surroundings, your weight on the scale won't.  Think about how you would "weigh" less in a pool if you took a deep breath.  Obviously, you didn't lose any mass when you took that breath.

Then again, a fart is mostly methane and hydrogen, right?.. and those are LIGHTER than air.

So maybe you would weigh MORE after letting a really big one rip...

 sweet...haha!!!  Now everyone is really going to start eating their brocoli!

But that's only if you replace the fart with air...I don't think air flows in when I fart...but who knows.

Original Post by kallie67:

This made me laugh uncontrollably! 

I'm guessing it's the scale, for the aformentioned reasons about what gas weighs/doesn't weigh.

But I'm still gonna try this next time...welll...you know.  Purely for scientific research!

 I'm glad I'm not the only one that finds this funny...I've been smiling all morning...since I woke up and decided I had to post this.

Broccoli and eggs and red meat - If I do all that at one meal, I'll have lots of research material.

*plans breakfast menu tomorrow of steak and scrambled eggs with some broccoli tossed into the egg mix*

That oughta do it!

Wow, this farting has really taken off!!

 

sprays room with jasmine air freshener

Broccoli farts and jasmine air freshener...quite the combo we got going on!

THE NEXT BIG HOLLYWOOD DIET:  Intentionally eating foods that will give you gas, but weighing yourself both before and after the fart and taking the lower of the two.

Original Post by yountsmonster:

THE NEXT BIG HOLLYWOOD DIET:  Intentionally eating foods that will give you gas, but weighing yourself both before and after the fart and taking the lower of the two.

 or just holding it in until you are completely full of gas!!...hey...maybe we've just discovered a way for humans to fly!

Methane has a specific gravity of 0.5537.

That means that you should have gained weight after farting.

Unless you sharted

Exactly... they say a fully spherical geodesic dome can float if its big enough due to expansion of gases due to heating of the structure by the sun.

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.
Original Post by frothbeast:

Methane has a specific gravity of 0.5537.

That means that you should have gained weight after farting.

Unless you sharted

 So is a fart really 100% methane?....seams deadly...no wonder the can reak so badly

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