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Background: I'm a legal MMJ patient and I've been looking into water pipers/bongs recently. I understand that this question can be a little controversial but where I live this is all legal as long as you have the proper prescription. Last few years there has been quite a lot of "scientific" bongs that has been hitting the market and in my to medicate as healthy as possible I would like to understand how they work. I know about vaporizers and I have a few of them, this is a physics question.

So to my question. What are the major fields that come into play when talking drag/resistance, smoke cooling and smoke filtration? My theory is that it is fluid dynamics.

Are there any good books to read to fully understand the mechanics behind the water bong?

Thank you

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Are you telling me that the way the air flows through a bong (set of restricted pipes filled with water) is not physics? Considering your age and post count I expected a more mature answer. I'm quite sure that the things I'm interested in drag and smoke cooling can be understood with Thermodynamics and Fluid dynamics. Smoke filtration would probably have a more chemical explanation. If you think my question is bad, feel free to give me a pointer on how I can make it better. –  user31816 Oct 28 '13 at 12:02
    
Check on two-phase-flow. –  Mike Dunlavey Oct 28 '13 at 13:17
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@user31816 It's not quite clear what the actual question is. –  Emilio Pisanty Oct 28 '13 at 13:24
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@user31816: My apologies, my comment was meant for the moderators and I did not realise it would appear under the question. In any case, the blah blah etc was just to pad it out to the required 30 characters and was not meant as an expression of disrespect. –  John Rennie Oct 28 '13 at 14:05
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closed as unclear what you're asking by John Rennie, Qmechanic Oct 28 '13 at 13:38

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