Thermodynamics of peeing?

[pontifex]

Originally posted by: theprodigalrebel
This should be a classic thread.

i thought all potty threads were going to be locked?

 

[Goosemaster]

Originally posted by: pontifex

Originally posted by: theprodigalrebel
This should be a classic thread.

i thought all potty threads were going to be locked?

this thread is about numero uno man.

 

[Canai]

Originally posted by: Goosemaster

Originally posted by: Canai
Wouldn't the increased surface area of ~98.6º liquid cause the room to warm slightly?

*paging newton*

I'm dumb when it comes to this kind of stuff

So I don't really know what you mean heh.

 

[Kadarin]

Posting in an epic thread.... :thumbsup:

My dog pees all the damned time, but I'm not about to stick a thermometer up his ass to check his body temp.

 

[Goosemaster]

Originally posted by: Canai

Originally posted by: Goosemaster

Originally posted by: Canai
Wouldn't the increased surface area of ~98.6º liquid cause the room to warm slightly?

*paging newton*

I'm dumb when it comes to this kind of stuff

So I don't really know what you mean heh.

There is a differenatial equation that can easily help you calculate the change in temperature of an object due to ambient temperature VV the change in ambient
temperature due to an object.

It's really idealistic though and assumes a lot though... (ideal condistions, SP (standard pressure @ 760mmHg) iirc. It's been a long time though

 

[Suspicious-Teach8788]

The driving force to pee coems from a free energy change in doing so. Clearly, peeing reduces the concentration of pee in the body, so the concentration gradient is from a high to low. This obey's Fick's laws of diffusion, which typically is in line with the free energy curves. If you draw a common tangent to this free energy curve, you can see the driving force.

Originally posted by: Canai
Wouldn't the increased surface area of ~98.6º liquid cause the room to warm slightly?

but the urine diffuses into the water and so you are not increasing any surface area.

 

[Goosemaster]

Originally posted by: Astaroth33
Posting in an epic thread.... :thumbsup:

My dog pees all the damned time, but I'm not about to stick a thermometer up his ass to check his body temp.

get us some clips of his tonguebefore, during and after....

Nobel..I have you now:evil:

 

[Goosemaster]

Originally posted by: DLeRium
The driving force to pee coems from a free energy change in doing so. Clearly, peeing reduces the concentration of pee in the body, so the concentration gradient is from a high to low. This obey's Fick's laws of diffusion, which typically is in line with the free energy curves. If you draw a common tangent to this free energy curve, you can see the driving force.

Originally posted by: Canai
Wouldn't the increased surface area of ~98.6º liquid cause the room to warm slightly?

but the urine diffuses into the water and so you are not increasing any surface area.

technically, if it is a toilet, it is a bowl shaped object whose diamter expands (unless you clogged it with TP and god help you) increasign the overall SA making contact with the ambient gasses

 

[Canai]

Originally posted by: DLeRium
The driving force to pee coems from a free energy change in doing so. Clearly, peeing reduces the concentration of pee in the body, so the concentration gradient is from a high to low. This obey's Fick's laws of diffusion, which typically is in line with the free energy curves. If you draw a common tangent to this free energy curve, you can see the driving force.

Originally posted by: Canai
Wouldn't the increased surface area of ~98.6º liquid cause the room to warm slightly?

but the urine diffuses into the water and so you are not increasing any surface area.

OK, I guess I could have worded it better.

You release a liquid that is higher than ambient temp, and this liquid will cool, causing surrounding air/water/whatever to heat. Your body will continue to heat itself, radiating heat.

So now, instead of just your body radiating heat, there is now a secondary source of heat in the room.

I think that makes sense.

 

[Goosemaster]

Originally posted by: Canai

Originally posted by: DLeRium
The driving force to pee coems from a free energy change in doing so. Clearly, peeing reduces the concentration of pee in the body, so the concentration gradient is from a high to low. This obey's Fick's laws of diffusion, which typically is in line with the free energy curves. If you draw a common tangent to this free energy curve, you can see the driving force.

Originally posted by: Canai
Wouldn't the increased surface area of ~98.6º liquid cause the room to warm slightly?

but the urine diffuses into the water and so you are not increasing any surface area.

OK, I guess I could have worded it better.

You release a liquid that is higher than ambient temp, and this liquid will cool, causing surrounding air/water/whatever to heat. Your body will continue to heat itself, radiating heat.

So now, instead of just your body radiating heat, there is now a secondary source of heat in the room.

I think that makes sense.

technically that heat was part of your body and was contributing to the ambient temp, so you aren't introducing free heat...you are jsut introducing heat that was already there, more quickly, no?

 

[potoba]

your body produces urine constantly, doesn't it? but the fact that your brain has to hold your pee will prolly heat up your body. Just my guess, though

 

[bleuless]

i never realized there are so many backyard scientist on anandtech. who needs education when we can all just come on anandtech.

 

[Canai]

Originally posted by: Goosemaster

Originally posted by: Canai

Originally posted by: DLeRium
The driving force to pee coems from a free energy change in doing so. Clearly, peeing reduces the concentration of pee in the body, so the concentration gradient is from a high to low. This obey's Fick's laws of diffusion, which typically is in line with the free energy curves. If you draw a common tangent to this free energy curve, you can see the driving force.

Originally posted by: Canai
Wouldn't the increased surface area of ~98.6º liquid cause the room to warm slightly?

but the urine diffuses into the water and so you are not increasing any surface area.

OK, I guess I could have worded it better.

You release a liquid that is higher than ambient temp, and this liquid will cool, causing surrounding air/water/whatever to heat. Your body will continue to heat itself, radiating heat.

So now, instead of just your body radiating heat, there is now a secondary source of heat in the room.

I think that makes sense.

technically that heat was part of your body and was contributing to the ambient temp, so you aren't introducing free heat...you are jsut introducing heat that was already there, more quickly, no?

Right, but the heat from the liquid was unable to be dispersed into the room until it left your body. If your body doesn't cool and keeps radiating heat, then it seems to me that there is a second source of heat introduced into the room that was unable to radiate before.

Man this is getting confusing...

 

[edro]

Removing a heated substance from any system should lower the system's overall energy...no?

 

[Canai]

Originally posted by: bleuless
i never realized there are so many bathroom scientist on anandtech. who needs education when we can all just come on anandtech.

fixed.

 

[Goosemaster]

Originally posted by: Canai

Originally posted by: Goosemaster

Originally posted by: Canai

Originally posted by: DLeRium
The driving force to pee coems from a free energy change in doing so. Clearly, peeing reduces the concentration of pee in the body, so the concentration gradient is from a high to low. This obey's Fick's laws of diffusion, which typically is in line with the free energy curves. If you draw a common tangent to this free energy curve, you can see the driving force.

Originally posted by: Canai
Wouldn't the increased surface area of ~98.6º liquid cause the room to warm slightly?

but the urine diffuses into the water and so you are not increasing any surface area.

OK, I guess I could have worded it better.

You release a liquid that is higher than ambient temp, and this liquid will cool, causing surrounding air/water/whatever to heat. Your body will continue to heat itself, radiating heat.

So now, instead of just your body radiating heat, there is now a secondary source of heat in the room.

I think that makes sense.

technically that heat was part of your body and was contributing to the ambient temp, so you aren't introducing free heat...you are jsut introducing heat that was already there, more quickly, no?

Right, but the heat from the liquid was unable to be dispersed into the room until it left your body. If your body doesn't cool and keeps radiating heat, then it seems to me that there is a second source of heat introduced into the room that was unable to radiate before.

Man this is getting confusing...

It was able to radiate before. It's jsut that it was contributing to the heat of the body.

The key is that the body can adapt and change it's output depending on requirements.

I guess if we were taking mythbusters' dummy-filled-with-urine it would be more applicable to this part of the disscussion.

 

[Canai]

Originally posted by: edro
Removing a heated substance from any system should lower the system's overall energy...no?

nvm... Goosemaster said it better:

The key is that the body can adapt and change it's output depending on requirements.

 

[Goosemaster]

Originally posted by: edro
Removing a heated substance from any system should lower the system's overall energy...no?

it depends if the system has the ability to regain equilibrium or adapt to the change in a proactive fashion other than through the properties of physics.

 

[Goosemaster]

Originally posted by: Canai

Originally posted by: edro
Removing a heated substance from any system should lower the system's overall energy...no?

But doesn't the body continuously maintain a certain level of energy?

nah. I don't think I would put it out liek that.

I would proably say that it's heat production is what attempts to stay the same.

Energy is ...well you know...

 

[Goosemaster]

this acutally ended up being a neat thread..

not messy at all except for that 'peeing on your leg' bit

 

[BrunoPuntzJones]

Originally posted by:

Right, but the heat from the liquid was unable to be dispersed into the room until it left your body. If your body doesn't cool and keeps radiating heat, then it seems to me that there is a second source of heat introduced into the room that was unable to radiate before.

Man this is getting confusing...

This goes back to my car question.

If I pee in a jug while driving down the highway. I now have 2 objects that are 98.6F in the vehicle. If the A/C is blowing, it seems if I were to toss out the jug of pee and reduce the warm volume of the cabin, that it should cool faster no?

Edit: And I did really intend for it to be a serious thread. Well as possible as it could be

 

[Goosemaster]

Originally posted by: BrunoPuntzJones

Originally posted by:

Right, but the heat from the liquid was unable to be dispersed into the room until it left your body. If your body doesn't cool and keeps radiating heat, then it seems to me that there is a second source of heat introduced into the room that was unable to radiate before.

Man this is getting confusing...

This goes back to my car question.

If I pee in a jug while driving down the highway. I now have 2 objects that are 98.6F in the vehicle. If the A/C is blowing, it seems if I were to toss out the jug of pee and reduce the warm volume of the cabin, that it should faster no?

Edit: And I did really intend for it to be a serious thread. Well as possible as it could be

*trying to retain his composure *

you would immaditely be introducing another heat source because you would be looking at jsut a sample out of a larger situation.

You have the air which is variable which changes with the temperature of your body and the A/C. The temperature of the A/C which, for all intents and purposes is static, and the temperature of the body which is variabe, regulated by the body's reaction to the ambient temperature or objects in contact with it.

and answere to your question...

rephrease the last sentence...it is missing a word

 

[SludgeFactory]

The converse of this is drinking vast quantities of ice cold water in an attempt to burn calories. I see that one every once in a while online, never have seen the thermodynamics of peeing though.

 

[ArchCenturion]

If you pee on yourself, it will remove heat, due to evaporative cooling.

 

[FleshLight]

Originally posted by: ArchCenturion
If you pee on yourself, it will remove heat, due to evaporative cooling.

That depends on the relative humidity of the air. If the air is supersaturated, peeing on yourself will make you feel hotter.