How does a bong/hookah work?

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In summary, a bong or hookah works on the principle of suction. When you suck in, you reduce the pressure in your mouth, creating a pressure difference between the two ends of the tube. This pressure difference causes air to be pushed from one end, through the water, and into your mouth. The heat from the lighter or charcoals also plays a role in creating this pressure difference. When the entire hole is covered, air from the room cannot enter to equalize the pressure, resulting in different outcomes. The suction effect can also be demonstrated with the example of two halves of a globe being held together without air inside.
  • #1
ecneicS
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I was watching my friends smoke hookah last night thinking about how it works. I drew this simplified figure to help for anyone who doesn't know what a bong or hookah looks like. I know that it works on the principle of suction, but what IS suction?

1. Why do different results occur when I suck on the top with my lips fully around the opening (insert sex joke here) aka creating a suction, compared to when I just suck in air with my mouth very close to the opening?
2. Why does sucking air from the taller tube cause air from the smaller tube to enter the the water?


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  • #2
When you suck in on anything, such as a straw, hookah, whatever, you reduce the pressure in your mouth. On the other side of the straw or hookah the air pressure around you is pushing down and in. Since there is a difference in pressure the air is pushed from one end, through the water, and into your mouth/lungs finally.
 
  • #3
I believe the heat from the lighter/charcoals has a lot to do with the pressure created.
 
  • #4
TeslaG said:
I believe the heat from the lighter/charcoals has a lot to do with the pressure created.

I don't buy it. For one thing, the resistance when sucking air isn't any different whether the contents are on fire or at room temperature. Also, any pressure change caused by natural convection from the hot contents would suck air up through the smaller tube, which is the wrong direction.
 
  • #5
Drakkith said:
When you suck in on anything, such as a straw, hookah, whatever, you reduce the pressure in your mouth. On the other side of the straw or hookah the air pressure around you is pushing down and in. Since there is a difference in pressure the air is pushed from one end, through the water, and into your mouth/lungs finally.

Why does the pressure in your mouth have anything to do with this system? I understand that breathing in decreases the pressure in the tube you are taking in air from, but how does that affect the other side of the tube? There is a pressure difference between the two volumes, but how do they directly experience each other when there is a body of water in between them? My view is clearly wrong because a bong does work, however I find this dilemma is comparable to two rooms of different pressures that are separated by a brick wall. Does the gas exchange take place through the water because the pressure differential force is greater than any resistant forces created by the water?

TeslaG said:
I believe the heat from the lighter/charcoals has a lot to do with the pressure created.

You can still suck air from one tube to the other even when nothing is lit.
 
  • #6
ecneicS said:
I was watching my friends smoke hookah last night thinking about how it works. I drew this simplified figure to help for anyone who doesn't know what a bong or hookah looks like. I know that it works on the principle of suction, but what IS suction?

Awesome question, and even awesome-er picture. I'm glad I'm not the last person who uses mspaint.

1. Why do different results occur when I suck on the top with my lips fully around the opening (insert sex joke here) aka creating a suction, compared to when I just suck in air with my mouth very close to the opening?

When the entire hole is covered, air from the room cannot get into equalize the pressure.

2. Why does sucking air from the taller tube cause air from the smaller tube to enter the the water?

The way this was explained to me in school was as follows: there is always a great deal of air pressure (well, ~ 1 atmosphere of pressure, which is about 15 lbs per square inch, which sounds like a great deal to me at least) pushing on everything from all sides -- this is usually demonstrated by taking two halves of a globe and evacuating all of the air from them; the "suction" that keeps them together is really just the lack of air inside "pushing back". So the same thing happens with the bong -- you lower the pressure at the top of the container, so that pressure isn't there to push the water back down against the air pushing at the lit part, so air enters there.

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1. How does the water in a bong/hookah help filter the smoke?

The water in a bong/hookah acts as a filter by trapping larger particles and ash from the smoke, resulting in a smoother and cleaner hit.

2. What is the purpose of the percolator in a bong/hookah?

The percolator in a bong/hookah is designed to further filter and cool the smoke by breaking it into smaller bubbles, increasing the surface area and improving the overall smoking experience.

3. How does the smoke travel through a bong/hookah?

The smoke travels through the bong/hookah by being pulled through the bowl or tobacco chamber, down the stem, and into the water. It then travels up through the water and into the mouthpiece, where it is inhaled by the user.

4. What is the purpose of the bowl in a bong/hookah?

The bowl in a bong/hookah is where the tobacco or smoking material is placed. It is heated by a flame, which creates smoke that is then pulled through the bong/hookah for inhalation.

5. How does the smoke become cooled in a bong/hookah?

The smoke becomes cooled in a bong/hookah by passing through the water, which helps to lower its temperature. It also goes through the percolator, which further cools the smoke by breaking it into smaller bubbles. This results in a smoother and less harsh smoking experience.

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