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so the thing with water cooling is there's a few different reasons people do it some do it for performance you

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know getting them over clocks some people do it for looks although that

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clearly wasn't the case here and some do it for silence

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now here's the thing though no matter how

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many radiators you throw at your system like you could put like six radiators on

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this thing you could take all the fans off and it would easily dissipate the

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heat from a CPU and a graphics card you are still going to be stuck with at

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least one moving part and that's your pump now sometimes pumps take the form

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of like a big standalone piece like this like with a custom loop while other

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times you're gonna have it kind of built in or integrated into something else so

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this aio from nzxt has the pump built

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into the CPU block while others i believe ek does this for example build

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it into the radiator but you're always going to have that

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moving part which is a point of failure and a source of noise

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unless you don't

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this right here is a prototype

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water cooler with no pump

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how on earth does that work how well does it work

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i guess there's only one way to find out isn't there

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by sitting through this sponsor spot from pia private internet access keeps

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your ip hidden from anyone who wants to know and allows you to access services

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online as though you are from a different country check it out at the

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link in the video description

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so i first got turned on to the idea of pumpless water cooling when i was

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reading a post on extremesystems.org

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that's a blast from the past uh way back in 2008.

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so a user by the name of ocz tony who

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worked at you guessed it ocz at the time was doing some experimentation with

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their upcoming CPU water block which i'm not sure if it ever got released or not

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but it's hardly the point and he posted

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that he had figured out a way to use convection just the natural convection

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of the heat of the CPU warming the water

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causing it to rise up one tube and then get cooled by the radiator causing it to

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fall down the other tube in order to achieve enough circulation to get a

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functional like custom grade water

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cooling loop all without any risk of failing components and without any noise

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whatsoever tony's approach had a couple of fatal flaws though so for one thing

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it wasn't possible to get a ton of circulation so modern cpus like the 18

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core one in here we're going to have no chance of moving enough water to carry

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all that heat away and number two is that it relied on a very

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specific layout of the entire system so that the

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convection action could get started in the first place so the radiator would

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absolutely need to be above the CPU

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socket and then once you started to add multiple heat sources like you know a

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graphics card or something well then life gets really confusing

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fortunately there are other ways to move fluid around inside a closed system take

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this for example this looks like an ordinary pc tower cooler but inside

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these heat pipes are tiny capillaries

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that allow the coolant to flow up and

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down the heat pipe in order to allow it to transport heat much more quickly than

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just solid tubes of metal would be able to do

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that's part of what makes these things so efficient so in a nutshell then

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capillary action is the phenomenon that you would observe if you took a cup of

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water and then something thin like a straw for example and stuck it in you

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would actually see that the water level inside the straw would rise a little bit

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even though the force of gravity is working against it it's partly caused by

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surface tension and it is the exact principle that our cooler here works on

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now i only gave you guys a really brief look at this before but now we're going

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to take a bit of a closer gander so first we've got a bog standard radiator

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i think it's made uh i think it's made of aluminum and then we've got our CPU

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block here which looks pretty normal you've got your flat copper base and

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there's only really a couple things about it that strike me as

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not ordinary so one is this little

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kind of looks like a fill port of some sort that's been terminated by pinching

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it shut kind of like you would do with a heat pipe and two

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the fact that the fittings the block itself everything about this thing is

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like soldered shut rather than using o-rings and screws in

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order to seal it they they are serious about keeping whatever's in here

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inside but will it work

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now this is 10 out of 10 engineering

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sample stuff uh ragin tech sent it over

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but this is like this is not to be evaluated for its

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performance or the packaging or anything like that this is

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just a concept stage device

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which means that mounting this is

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probably not going to be that simple there's no instructions so

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that kind of looks like it goes there

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that kind of looks like it goes there and there

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and there this really does just look like cobbled together from

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scrap metal they found in the warehouse or something

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are these thumb screws or just spacers these are these are thumb screws

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uh well

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you only live once especially if you're this poor CPU this

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is my favorite thing about oh no did it go in the power supply

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a screw in your power supply is a bad freaking time

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one of the nuts appears to have gone missing well

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hopefully we have an alternative nut oh heck yeah the nuts from my test bench

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work that was easy i didn't have to go very far at all

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we're also going to need a couple of cooling fans

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did they say something about it needing to be above trying to remember

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yeah now there's some for sure so because this process is heat assisted

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we're not actually expecting it to start flowing right away like how would it do

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that what would power it so we're actually waiting

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for the heat output from the CPU

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to move the water around we're converting heat energy into mechanical

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energy but that means if there's no load on the

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CPU then it's going to take a while for it to get hot enough down here to begin

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that process i mean you can see here our CPU is clearly not putting out a ton of

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heat and that is a hefty copper block on it

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so it's going to take a while for it to appreciably heat up now that CPU is

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pretty toasty at this point you can actually see we're getting some

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more bubble arch we're getting some real bubble action here there's a big there's a big bubble

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look at it go see that

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it's actually starting to flow now now what's interesting is you actually see

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bubbles flowing out of both sides

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now why would that be

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so you can see we're getting a little bit of kind of jerky coolant flow but

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CPU temperatures are actually well within spec it seems to kind of

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correspond actually to little bits of coolant kind of dripping

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down into the block so i actually may have recalled

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incorrectly this one may rely on some gravity assistance here so

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let's go ahead and

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provided so now this is kind of like having your radiator installed in the top of your

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case oh and CPU temps are way down they were

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up near 90 now they're in this upper 60s and they're more consistent

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okay so theoretically we're all set up properly ish now you can see that our

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CPU temps have settled in at around the

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low 60s and that's not great obviously this is an 8700k by the way that's not

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great for idle temperatures it's not even doing anything right now but you

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got to remember that this doesn't work unless we add enough heat and it's

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clearly working well enough that even though that's a high idle temperature

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we're well within spec so in order to get our coolant flowing

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more rapidly and to get the cooler working better we actually have to hit

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it with a load so why don't we go ahead and do that

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sure small fft 12 thread oh that's probably going to

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crush this poor thing but let's give it a shot whoa okay so our temps

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shoot up to 100 degrees basically instantly but what's interesting is you

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can see there's a lot more action down here at the cooler we're also going to

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want to check out what kind of clock speed we managed to maintain throughout this so we're still at 3.7 gigahertz

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which means we're getting enough coolant flow that the thing's not just like

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gonna immediately die we hope

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now let's have a look at our coolant flow here so what's weird is we've actually got

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liquid returns

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on both of these

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which would suggest that it's turning to vapor to move up to

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this radiator so maybe the configuration

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can be tweaked once more just trying to remember what their

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instructions were i could have i could have looked this up before we started

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but what fun would that be sorry i'm leaving now

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it's possible that the design expects the motherboard to be oriented the way

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it would in a typical tower case so why don't we go ahead

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and do that just hold the board in place there we go

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all right now let's see how she goes

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oh interesting our temps are down in the high 90s range

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now also our speed which had fallen down to

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about 3.5 gigahertz is up to 3.63 we're

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clearly turboing higher what's weird is that it appears as though it's operating

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more like a heat pipe cooler right now with the thick tube

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doing most of both the liquid and gas

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movement why use only capillary action

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when you can use convection as well we could tell that all the action was in

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our top tube here but the top one was the thick one

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so if we were to change it around and use our skinny one as the top instead of

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having those two forces work against each other

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we could hopefully have them work together

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we can't use temperatures to differentiate our orientations here

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because they're all going to hit 100 degrees in thermal throttle

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but what we can see is how far it throttles and this actually throttles

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much worse than our previous configuration

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now we're back up to now now we're up to 3.8 gigahertz

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what is your logic so this is clearly the hot side

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this side is pretty hot too um

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okay so i gave in i consulted the materials they sent over back when they

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provided this unit and it appears as though this was the correct

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configuration with the small tube on the bottom the big one on top and the

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radiator up above so let's go ahead

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and try it one last time

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so this is the best result we've gotten so far we've only got one core that's at

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100 degrees and we're turboing up to about 3.8 mid to 3.8 high gigahertz that

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is not a bad result now it's obviously

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not a perfect result which is probably a big part of the reason that this even

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though they've shown samples of it as long as like

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a year and a half ago hasn't turned into a commercial product

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yet because there's a lot of fine tuning to make this work for one basically

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endless tuning and tweaking could be done on the diameter of the tubes in

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order to allow for better coolant flow for another there's all kinds of

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different fluids with low boiling points which is part of what actually allows

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this rapid movement that could be used to charge a system like this we don't

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know what they're using inside i'm sure once they figured out a formula that

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works they would hold that as a very closely guarded trade secret for another

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thing remember how we showed that this whole

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system was sealed up well maybe they're

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maintaining it at something other than atmospheric pressure that could also

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affect the characteristics of the entire system so

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nothing like this is available from you know

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any household brand that you'd recognize at this point in time but

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i would say that this works well enough

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that there is still potential for this technology and i'm personally very

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excited for the truly silent water

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cooler i mean ignoring that this particular one

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has fans on it and that it'd be very difficult to diy something like this but

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details details details

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oh yeah and the bubbling does actually make noise

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you can probably hear it

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