Lava lamp centrifuge

posted Mar 8th 2010 9:06am by
filed under: cellphones hacks, home hacks

Like many projects, this one started with a harmless question. “Will lava lamps work in a high-gravity environment such as Jupiter?”. Well, as it turns out, this harmless question was not so easily answered. The only real solution was to test and prove for sure. To do this, [Neil Fraser] built a centrifuge in his living room. At 10 feet across and roughly 50 kilograms, this is no small toy. The end with the lava lamp is set to pivot, so at a stand still, it is positioned vertically and at full speed it is positioned horizontally. The whole process is recorded on video for proof. So, does a lava lamp work in high gravity? Watch the video or read the article to find out.

[via Makezine]



72 Responses to Lava lamp centrifuge

  • SB says:

    Why would anyone like to know :P

  • thenuyguy says:

    I have a feeling this was one of those projects that got a bit outta hand, no?

  • Chris H says:

    How did they manage to make the heat work in the same plane as gravity? For one of the principles of a lavalamp, as I understand them, is that there is a heater at the bottom causing some interesting flows as the liquids react to the temperature change.

    As far as I can tell their experimental setup, though interesting, does not take the heat effect into account and therefore this experiment does not answer the important question whether we can decorate our household on Jupiter with these lovely items.

    Nevertheless let’s not despair as this setup can be used to test whether hamsters can run a treadmill on Jupiter. The heat effect is less important in that experiment!

  • pwrx says:

    This, my friends, is an experiment worth conducting.

  • Chris H says:

    on second thought, i may be wrong about the heat…

  • pff says:

    This man is clearly an idiot.
    using an audio connector to power a lava lamp is not a solution to any problem, it’s simply irresponsible.

  • Agent420 says:

    The answer is 42.

  • Olivier says:

    @Agent420: yeah, 42 RPM.

  • John says:

    Chris, you are wrong. Gravity is just a force, same as the force generated in this setup. The heat just causes density changes in the blob of wax. When it’s denser than the water, it will sink at a rate proportional to the force applied. When less dense, it’ll rise at a rate proportional to force.

    pff, He is using a 1/4″ connector. While this is an audio connector, it’s a fairly large one, and is often used in setups that need 360 rotational freedom. Sure, you’ve got a chance of blowing a fuse, but there’s really no better way to do this without spending a lot of money. As long as he’s watching it (and who would run a centrifuge without watching it?) it’s reasonably safe.

  • strider_mt2k says:

    Whatever happened to that experiment whereby we’d find out if ants can be trained to sort tiny screws in space?
    http://i74.photobucket.com/albums/i241/fotoload/350px-Deep_Space_Homer.png

    Oh…yeah.

  • James says:

    I like it, but surely the answer is fairly obvious from the physics of it? The oils only move because of their relative density change due to the heat. The heat is still present (though of course not convecting upwards, but still conducting and radiating to the liquid), gravity is still there only a little more forceful. (differential) Force = mass x gravity, all you’re doing is scaling up the g in the function?

  • John says:

    He might have a slight problem with the Coriolis effect. I think that’s why he gets that vortex at the bottom. Only one solution: build a bigger centrifuge!

  • Mimir says:

    3 meters, weighs about 50 kilograms. Not pounds.

  • Haku says:

    Mad science at it’s finest. Love it!

  • Theodore says:

    LOL. We all knew that lava lamps would work in higher gravity but this would let lava lamps work in space. I like the part when they hid in the next room and peeked through the door for safety. Any guess how fast the lamp or the counterweight was traveling at? Bet an interior door or the wall would stop ten kilos of mechano.

  • Ciric Tech says:

    I love the use of the erector set, it really takes me back. To bad I lost most of the parts as a kid. Anyway who cares if the experiment was valid thats some sweet engineering!

  • Frollard says:

    Also of note – the wind generated going over the lamp. I know my lava lamp doesn’t function when you have a fan blowing on it – it’s a delicate balance of heat, density and buoyancy to get a lava lamp to work. All other things being equal, the wind will over-cool this beast.

  • aztraph says:

    I love the rig. but:

    First: you wouldn’t be able to put it on the surface of Jupiter, it would immediately start to fall, the net effect would be equal to weightlessness. so no need for the centrifuge.

    Second: if you were on a spacecraft, you would have to be high enough in orbit to simulate free fall. again gravity would be negligible since any perceptible gravity would draw you towards the gravity well of the planet.

    of course the answer is yes, since the specific gravity of both liquids is based on its density, as the gravity fluctuates, both liquids are changed in equal proportion. what i would ask is: could he put a vacuum chamber on it to simulate the vacuum of space.

    wonderful build, my wife would never let me put something like that in our living room. can you imagine the mess it would make and the damage it could do? THAT’S hack worthy by itself.

  • nubie says:

    Wow, this is a super sweet hack.

  • Eddie says:

    Look they are building WMDs !

  • barry99705 says:

    @aztraph
    Jupiter has a solid surface. It’s not gas all the way through.

  • kvmanii says:

    I busted out and started laughing when the shot actually showed the lavalamp…I have no Idea why.. this was great! Cheers!!!!

  • cheese says:

    Actually using an audio connector as a rotary electrical connector is genius.

  • barry99705 says:

    @pff
    You know what? For the couple hours this guy is playing with this, that 1/4″ audio connector will work just fine. It’s a “hack” not a permanent structure.

  • andrew says:

    Great video! River dance FTW

  • andrew says:

    His g-sensor (a cell phone) reports 2.something g’s — not exactly Jupiter

  • Robert says:

    OMG! I’ve been wondering this for the past 18 years! Now I know that I can bring it on my next trip to Jupiter!!

  • pod says:

    interesting use of a nexus one

  • walt says:

    glad I don’t live there. *walk in the room…thwaaaack!*

  • Jerry says:

    Lavalamps work because of different density in the fluids, which change according to temperature. No matter what g-force there is, if there is one it will work, even with negativ g, the fluids would just change direction. Useless experiment is (well done and cool but still) useless

  • wdfowty says:

    lol @pod. you beat me to it.

    @jerry, i don’t think it’s a complete waste of time. now we know how to build a centrifuge with an erector set. XD

    i was wondering, though slightly off topic, wouldn’t the gravity of jupiter crush the lava lamp before you could even plug it in?

  • charliex says:

    it sucks that lego beat out meccano, however this is awesome

  • Hacksaw says:

    Who really cares if a lava lamp will work on Jupiter? I love it because he BUILT A CENTRIFUGE in his living room!

  • TempFile says:

    I agree with Hacksaw. CENTRIFUGE IN LIVING ROOM WITH ERECTOR SET. A fine idea of using an audio for power, at least for now, and he has quite a nice setup for the lamp, camera, and cellphone.

  • derp says:

    ya no matter he was actually doing, an erector set living room centrifuge is AWESOME

  • risu says:

    Don’t think the gravity is only issue of lava lamps on Jupiter. The pressure of the atmosphere is far greater than anything on Earth. That glass would only survive a few miles into the atmosphere. Plus friction from the wind would heat up the glass, making the light useless. Cool experiment though.

  • JB says:

    50 kilograms (fix the article please) and 3 meter long centrifuge. Love it. I wouldn’t do it in my living room though :)

  • mowcius says:

    @kvmanii

    Yeah same, the lava lamp made me laugh too! :)

  • Arkenklo says:

    The world needs more people like this.

  • aztraph says:

    to barry99705: true, but good luck getting a lava lamp to survive the trip intact. plus once you get that far deep into Jupiter, the mass above you would probably lessen the G’s you would feel, if the pressure didn’t kill you. but hey since we’re discussing the impossible, you are absolutely right. good job nit picking.

  • supershwa says:

    What the…holy…@*#!

    A centrifuge…in your living room…with a flippin’ erector set?!

    That’s motherlovin’ AWESOME!

  • localroger says:

    Actually, getting the lamp to work on Jupiter is simple. You suspend it beneath a balloon. You will see Jupiter’s full gravity at its visible “surface,” no relative wind, and only whatever pressure the balloon is designed to float in. Of course, since the atmosphere is mostly hydrogen already you’ll need a big balloon inflated with really pure hydrogen to get lift…

  • Daniel says:

    Does this mean that, lava lamps would also work on uranus?

  • x_25 says:

    @pff

    1/4″ audio connectors are actually rated for at least 250v (the one’s from Radio Shack) and in pro set ups deliver upwards of 2-3kW into loads as low as 1 ohm. The can take powering a lava lamp.

  • Torsten says:

    I’m wondering how long it take to reach his bandwidth limit. 200MB of Videos and it seems to be hosted on a private server.
    Poor fellow, he might have to pay a reasonable sum to become a hack-a-day entry.

    Just wonder if the hack-a-day crew send some warnings to the original authors before publishing the stuff….

  • dougefresh says:

    He needs to build an enclosure around the lava lamp so that it is not effected by the cooling of the wind so the test is more realistic. Unless he is testing on Jupitor and is trying to replicate a really windy day plus the increased gravity.Like follard said…

  • Jikki says:

    Is it just me or does it look like the base of the lava lamp is facing towards the inside of the centrifuge? Wouldn’t that make it low gravity? Or am I just blind and talking out my ass?

  • D- says:

    OK was I the only one to notice that the centrifugal force applied did NOT replicate gravity as the lamps experience gravity in their normal mode of operation? The centrifuge itself is pretty far out. In that a lava lamp would most likely accompany a human, safe to assume it would be in the same protected environment and wouldn’t be damaged at all. I would have expected a lava lamp to function in any gravity to some extent, expecting the shapes, and the rate the shapes change to vary.

  • Mr. Twister says:

    Gary Coleman you’re next….

  • Miska says:

    @wdfowty
    I’m suprised you were the first person to point out that the gravity on Jupiter would simply crush the lamp into a very subcompact structure.

  • Eugene says:

    Bouyancy functions the same because all the liquid in the lamp is in the same gravity (or force in this case?). The atmospheric pressure would not affect the gravitational force because it is applied from all directions. It would be possible to construct a lava lamp that would survive unprotected from atmospheric pressure of Jupiter (ignoring the high temps) by pressurizing the lava lamp liquids to the equivalent atmospheric pressure of Jupiter. A balloon could function in the atmosphere by using hot hydrogen just as a hot air ballon on earth does. Arthur C. Clarke wrote a short story about this. The core is probably metallic hydrogen.

  • Eugene says:

    Even if you can reason out the answer to the question using known laws of science, there is no reason not to try this. I am always surprised by the number of nannies lurking out there. This is the way people learn things! Browse through some of the older issues of Popular Science or Scientific American Amatuer Scientist Column (30′s, 40′s and 50′s) before everybody became so concerned with safety. When I was growing up I regularly mixed chemicals that children would not be allowed to touch today or wired circuits and plugged them into the AC outlet(ungrounded and you could plug in the cord turned around) sure I had explosions and short-circuits but I survived and learned from my experience. People seem a bit to timid these days.

  • Michiel says:

    OMG.., that is just crazy.., LOL ! :D

  • CtrlAltElite says:

    “Gravity is just a force”
    No it’s not – it’s an acceleration.

  • CtrlAltElite says:

    “Of course, since the atmosphere is mostly hydrogen already you’ll need a big balloon inflated with really pure hydrogen to get lift…

    Or, as Clarke suggested, hot hydrogen.

  • robomonkey says:

    I KNEW IT, I KNEW IT….

    The Jovians are here to take all our Lava Lamps…lock up your daughters, they’ll be next.

  • Lavalamp'sSon says:

    My daddy was a rollin stone…

  • Whatnot says:

    They should have asked (NASA) scientists and meteorologists first and then do the test to see how off their predictions were, now that would have been a telling test I bet.

  • troll says:

    i know that Hackaday is not the place to be asking dumb questions like “why”..
    but seriously….. Why??

  • Troel says:

    I was expecting a cat to come in and start batting at the lamp, knocking if off balance and creating a spectacular crash. Or perhaps the phone’s vibrator itself it it just so happened to oscillate at the resonant frequency of the centrifuge.

    Is this something T-Mobile’s extended platinum plus warranty covers? How exactly would you explain the chunks of drywall and metal sticking out of your phone.

    To the original hacker, I have but one thing to say:
    MOAR SPEED!!!!

  • TRB says:

    @Jikki
    It is pointed towards the outside actually. The shot of the lamp next to the phone isn’t wide enough to tell direction from. But if you watch the beginning when the centrifuge is spinning up, you can see the lamp start to tilt inward as its base is pulled outward.

  • Evan says:

    That is simultaneously one of the most awesome and one of the most terrifying videos I’ve seen in a while.

  • L Stark says:

    Some clown put a lava lamp on a stove to see what would happen. It blew up and killed him. I was going to do the same experiment the same day, but got lazy. Thankfully I am too lazy to kill myself with idiot moves(so far).

  • Dude says:

    This is SOO lame. Of course a lava lamp doesn’t work on Jupiter. There’s no outlets!

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