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Gravity bong? (merged)

Heh austior excellent explanation. One thing I have been wondering about though. I know they say there is a certain amount of time it takes for THC to be absorbed into the bloodstream. But what about the smoke sitting in the bong? If you fill a g-bong with smoke and wait too long, will the cannibanoids condense onto the inside of the bottle quickly?

Also, I have heard talk of a "vaporiser" that can be placed directly into the bowl of your pipe or bong. If you used one of those with a gravity bong would it be just about the ultimate in efficiency?
 
Smoke will condense considerably less quickly in your bong. This is because the surface area of your lungs is 2 orders of magnitude larger than that of a bong. One estimate I read put the total surface of your lungs at I believe 150 meters squared. This is about the size of a large room (or small house.) If you fill your grav with smoke and wait a couple seconds you'll notice that the smoke gets markedly thinner (less smokey) quite quickly.

This seeming contradiction is resolved by noting that the small particles that make up smoke, once cooled, quickly form larger ones due to mid-air collisions between the particles. Suppose four particles collide to form one large one, which we will suppose to be spherical. This larger particle obviously has four times the volume of any of the smaller ones. But, the PROJECTED AREA (the areas if you took a photograph of the two spheres next to eachother) of the new sphere is the three halfs root of 4 (about 2.5) times larger, and this means that the new sphere absorbs about 40 percent less light than the old spheres combined.

This is not to say that effect of smoke condensing in your bong should be completely ignored (eventually, the whole hit will stick to it.) It's just gonna take a few minutes for this to happen.

Vaporizers: I don't have too much experience with these, but considering how long it takes to heat the weed up, a considerable portion of the vapor released may stick to the inside. I suspect that most vaporizers are not very efficient compared with a regular old pipe or bong.
 
That's what I call backing up your oppinions, I got tired just thinking about all those calculations =D

Out of curiosity, would this "forming of larger particles" make the smoke harsher and harder to hold in? Because although the smoke doesn't seem to dissipate, inhaling a hit that has been standing around for a minute is a VERY unpleasant experience! Any connection to that stuff you were talking about earlier?

--- G.
 
so i guess you've done some biophysics courses? yuo seem to know your shit about the projected area of "smoke particles". maybe you can show me something that would back this up a little? and what are these particles? i guess some by-product of weed...
 
This is a good question, which I don't know the complete answer to, but here's what I got. I have definitely noticed the effect you are talking about, taking one of these hits is a nasty experiece, considering how cool the smoke is at this point. The only explanation I can think of is that the hit is condensing more quickly onto your lungs.

The processes involved in the depositing of a rapidly changing colloidal mixture on a surface would seem to resist any simple (pencil and paper) analysis. Firstly, the temperature is changing (it will have a negative exponential curve.) As discussed, the size of the particles is also changing. Now we could fairly easily find a formula for the size of the particles over time (assuming they are spherical and always stick to eachother) if we knew the distribution of speeds of the particles. We could find this (approximately) given the temperature and the mass/cross sectional area of the particles. Now we notice (to our horror) that we have two changing variables whose values are mutually dependent. This means (if we are using continuous analysis, basically calculus) that we have to solve a simultaneous differential equation in (at least) two variables. Actually the number of variables will probably have to increase as we continue the analysis. At this point we realize, given that the solutions to complicated multivariable differential equations are almost always either impossible (literally) or unbelievably hard and, more importantly, the physical dynamics of pot smoking are not that important, that we would be best off giving up. Actually, if we came up with a formula it would likely have a large margin of error making it practically useless. A physical experiment or computer simulation would be a better route, if we really wanted to characterize the process completely.

That said, I have a theory as to what is really going on, for which I have no evidence whatsoever. The particles may actually become big enough for gravity to play an important role in their motion. Rather than moving in a brownian (random) motion, they would drift slowly downward, making a much thicker than normal in certain parts of your lungs (rather than being spread evenly.) I figure the lungs can feel this and don't like it.

This might get you higher or less high, I don't know.
 
Kanaba said:
so i guess you've done some biophysics courses? yuo seem to know your shit about the projected area of "smoke particles". maybe you can show me something that would back this up a little? and what are these particles? i guess some by-product of weed...

No, I have only taken introductory college biology, most of my other science courses were in physics or math. I do know that cannabis and other types of smoke are colloidal mixtures, which I have studied in class. I only assume the sphericality of the particles because the specific shape of as whole bunch of objects tends to not matter (I suspect they are initially spherical anyway) And the average projected (cross sectional) area of ANY three dimensional shape goes as the three halfs root of its average diameter.

Also, I'm not too serious with most of these posts. If nobody is finding these either funny or informative, I will can it and stick to posting trip reports and whatnot.
 
austior said:
Also, I'm not too serious with most of these posts. If nobody is finding these either funny or informative, I will can it and stick to posting trip reports and whatnot.

NO, don't !! :D

Please keep posting here, your posts are extremeley valuable. Do go on..
 
i no longer use gravity bongs, they make my lungs hurt and give me panick attacks.
 
Thanks, blowmonkey, your encouragement means a good deal.

I must now humble myself by pointing out two mistakes in one of my posts. One is a minor point, the other is a complete blundering of logic, that makes me want to slap myself...... 8( Both are contained in the following english sentence, which I hope to god I am never quoted on, as it would destroy my (*toke***cough*cough***no*ImOK*my*COUGH!**ah that's good shit! ;)) credibility.

And the average projected (cross sectional) area of ANY three dimensional shape goes as the three halfs root of its average diameter

Ok, this is false in two ways.

The big one first: The cross sectional area (in fact any two dimensional area, for example the surface area) of a sphere "obviously" goes as the square (NOT the three halfs root) of the diameter. What I was probably (I hope) trying to say was this: The average cross-sectional area of ANY three dimensional object (across an arbitrary axis) is proportional to (goes as) the three-halfs root of it's VOLUME. I have no idea where the fuck I got this "average diameter" thing from, It means nothing in this context.

Now, the second error: The largest cross section of a sphere (the circle described by it's equator) is exactly equal to it's projected area (It's shadow, if it was in a perfectly coherent light source, such as a laser or an infinitely far away star.) However, in the general case, this is not true, only certain solids have this property. For a counter-example think of a tree, which violates this non-rule all over the place.

That said, it is still reasonable to assume the projected area of these particles will roughly correlate with the average cross-section. We would need the particles to deviate a great deal from sphericality (they would have to cast numerous shadows on themselves, from most angles) for the totality of cross-sections to NOT correlate roughly linearly with the amount of light absorbed/reflected in the smoke.

Ok, this should be pretty much correct now (given my assumptions.)

Not to make silly excuses, but I was sober when I wrote that last one, so In my overconfident state, I didn't bother to read what I had written before posting!

BTW, the proofs of all the theorems I'm using are pretty simple. The result about average cross sectional area is particularly easy (and useful), and a great example of how math allows us to prove lots of very general things fairly simply. So, I'll post the proof to this one and any others you might be interested in later today.
 
alright man, i don't mean to get down on you and all, i just think that lots of people on these forums make the mistake of not holding extremely articulate people up to the same scrutiny as they hold all the others. I dig what you're sayin... i just think everyone's opinions should be challenged on a level playing field, regardless of how intelligent you 'sound.'
 
Kanaba said:
alright man, i don't mean to get down on you and all, i just think that lots of people on these forums make the mistake of not holding extremely articulate people up to the same scrutiny as they hold all the others. I dig what you're sayin... i just think everyone's opinions should be challenged on a level playing field, regardless of how intelligent you 'sound.'

This is definitely as it should be. Some people get frustrated arguing with me because they don't understand what I'm saying (this is MY fault.) Sometimes what I'm saying is complete nonsense, though I try at all costs to avoid this. But I try to be open minded (in most subjects) and I actually ENJOY having my personal hypotheses disproven. I can't remember who it was but an eminent early twentieth century scientist (I'm positive it was a mathematician or physicist) once remarked that he considered it a good day if he had disproven a pet hypothesis before he sat down for brunch. The moment I read this I had one of those rare instant enlightenment experiences (when you realize something so simple you can't believe you didn't notice it before ***see footnote ), and obviously I took it to heart. I now try to rougly structure my life around this process.

I think we could have a chance to sit down and chat you would find me easygoing and personable, and not too terribly articulate (I write a WHOLE lot diffferently than I talk. Actually, most of the people who know me (physically) don't have a clue as to my opinions on the subjects of math science and philosophy (some don't even know my views on drug use %)) I quite enjoy talking with people who might normally not be considered "articulate", they often have very interesting and unique views, though it might take a while for you to get them. Quite often their intelligence is very vigorous (perhaps from being put down or trivialized too many times, by people who don't understand them. Whatever doesn't kill you can indeed make you stronger in certain ways)

Conversely, there is a vast subgroup of "articulate" individuals who, though they might have a cunning command of the english language, and may even have mastered a difficult subject (doctoring, lawyering, philosophizing, etc.), are so stubborn in their though process that, when they are trying to defend their (usually numerous) cherished opinions, you fear your brain will bleed were you to continue paying attention to them. You DEFINITELY know who I'm talking about here. Though you'd have to try pretty hard to find one of these on bluelight,and I can't remember running across one, I suspect some will be lurking here as well, given the size of this forum. These are some of the least charming people on the planet. Their level of social conciousness is so close to zero that even god wouldn't know the difference. I have met many such people in my life. Often times I am tempted in to talking with them by their claimed professional status. I'm thinking perhaps I'll learn something. Then they let slip a couple of their opinions (complete with a few bits of trite, meaningless, pseudo-logical nonsense that they honestly believe is strongly supporting their views), and I will almost always just about let them have it. I fantasize about leading them on a seemingly innocent line of thought, at first seemingly backing up their opinions. They love this sort of shit, they will agree with you without fully thinking through what you're saying. I would wait for the perfect moment to strike (if you're wondering, this is when they start adopting your arguments and attempt to dazzle you by pretending they understand their implications even better than you, hence one upping you), then I would pound their tenuous "supporting arguments" open like a jackhammer. Now being smart people, they will realize exactly what has happened to them. In an instant they will at least understand what a jackass they're being, and may even catch a glimse of the TRUE nature of their opinions (that they ARE opinions).

Ok, I'll confess to attempting to live out this fantasy a couple of times. Thanfully I always manage to restrain myself when the guy or gal is a close relative, or is currently fixing my teeth, checking my vision, probing my testicles, etc. I even went through a phase of this, as an adolescent. Now, getting to the metaphorical orgasm in this highly masturbatory process (their moment of realization), is always far harder than you (and more importantly I) think. Remember these people are often quite clever (often, more so than me, they just don't know where to use it!), hence they will quite often see your trap and abort the argument (a meaningful argument takes at least two people) equally cleverly. Rarely, I have actually acheived my intended climax, but always with highly unpleasent consequences. Now, as long as it's still hitting them (the expression of dread is creeping across their face), this is quite pleasurable. I cannot however emphasize enough the brevity of this moment (in my experience). Almost instantly their powerful sense of denial will kick in, they will hate you for that moment of pain, and they will freak out on you. At that point I feel like a complete and total jackass. Because I will then have a little realization of my own. I have just hurt a fellow human being for no reason other than my own pleasure. I have failed to consider their worth apart from some unpleasant and sometimes minor personality quirks. Sure, this person would make a lousy experimental physicist, but they may be a damn good doctor or industrial chemist. Their personality type, which may have been aggravated by environmental factors, will simply not allow them to learn anything from this kind of experience (being attacked by someone of lower status.) In the end, their denial reflex will be strengthened even more, and they will go on thinking like they have for years. It is best to give these people only a hint of your true views, it probably won't change them but the chances of this are still far preferable to the above method. Actually, sometimes this personality is good for them, it gives them the confidence to acheive. So, for them, the best survival strategy may be to NOT change in the slightest, who am I to judge this?

Now, I have been on the receiving end of this too. If you're too over confident, even a non-bright person may point out a flaw in your thinking. Sometimes my confidence and ego get the best of me and I will temporarily (I hope) become that very person I hate the most, the blind intellectual. I have been led into dangerous logical territory I thought I knew well, only to be logically pounded into the pavement. Sometimes it takes only a very short and well placed sentence (like, correlation doesn't imply causation) to topple a personally precious tower of thought. Everyone has some drive for denial, which will replace logic with self-inflating garbage whenever it gets the chance. Now, when someone demolishes my argument, throroughly, I rarely get angry or feel embarrased for more than a second. Instead, I compliment the person on their observation and perhaps try to save face a little ;)

As a note, I envy people with the gift to express complicated ideas in a few words. As you can tell (from the length of some of these sentences), I'm not particularly good at this, though I try hard. Simple explanations are always accompanied by greater understaning (in the speaker and his/her audience.) Some masters of this art were Albert Einstein, Richard Feynman, and Carl Sagan (a known pothead, by the way). I am, in fact, hindered in this area by my upbringing (both my parents are professors of english, at the same college!) So, if I am sometimes too wordy, forgive this as a nasty habit that I would like to be rid of.

*** Actually I.V. DPT emulates this experience quite closely. I have to force myself to do this kind of thing only every couple of weeks/months for fear of going insane! The feeling of enlightenment (be it real or only perceived), is my most cherished of emotions.
 
so anyways, all i have is a 2-litre pop bottle with the very bottom cut out, where it starts to curve. it sits in an old juice container. the water is filled up right to the neck of the bottle, so you don't have to use any suction and risk getting a mouthful of that gross water. the bowl is from an old graffix bong, pushed through a very carefully crafted 2-litre bottle cap. the cap has been shaved down so it's just a little hat and sits on top. you hold it down with your fingers while pulling a bowl.

has anyone ever had a problem with drooling while taking g-bong hits? for some reason a couple girls i know do. it's kinda gross but they swear they can't help it. as soon as that much strong smoke hits their mouth, their mouth starts watering. i guess you could call that a pavlovian response :)
 
I wonder what the best container would be. I haven't tried a milk gallon thing, but it seems idel. If you get a one gallon water jug shaoed like a milk container, its bigger than a 3 liter, has a handle, and you dont have to screw the cap off to hit it, it just pops off. The only problem I can forsee is getting your hand pretty wet, to hold the handle your hand ywould have to go under the water. What do you guys think is the most ideal container?
 
synthetic sunrise said:
gravity bongs are to cannabis as syringes are to heroin. the best way to do it. you can make a half quarter last two weeks if you only use a gravity bong. [/B]

Well a quarter lasts monday-friday with my bucket. We just tend to call them buckets, and it they are definately the only way to smoke dope. We had one in school and would visit it before school, break, lunch and on the way home. I keep my personal one in my cupboard beside my bed
 
I love my gravity bong!!! We have a portable one that we make with a cooler of water and the two liter bottle. We use a tuba mouth piece for the mouth piece.. its great.. but yea don't over use it, my lungs started to hurt after a while.
 
Has anyone ever tried using hot water in their gb? It definitely makes the smoke go down easier in a regular water bong and I was curious... I'll try it out tonight and post here in a day or so.
 
Hot water should make the air inside more humid, thus making your smoke "damp" to a degree. Therefor it should be easier to inhale, because it's not so hot and dry, it's warm and damp. ;)
 
Hmm, I have generally found that hits with a large amount of water vapor are hasher on the lungs. BUT, the vapor in a hot water bong is not super-heated like the vapor that comes off your weed. This, I believe, opens up the airways in your lungs. Smoking this way (a hot water bong, or in the shower or a sauna) can be quite pleasant.
 
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