sparkler water

I am currently brainstorming a firework ignition liquid that contains what i call (sparkler dust) sparklers work by a flame burning a concealed paper packet of (sparkler dust) once this ignites the sparkler sends colored sparks everywhere. now thought that would be an excellent ignition system for fireworks

Posted by HH Engineering 9 years ago

different liquid detection sensor

I am building a biodiesel production system. at different points in the process, a tank will have different liquids in it (sometimes more than 1 type, separated out). for instance, there is a point where glycerol sinks to the bottom, while biodiesel floats on top. what i want to do is drain the glycerol from the bottom of the tank (via electronically controlled solenoid valve), then when a sensor detects a change in material (biodiesel), shuts off that valve and opens another (final product tank). for the life of me, i cannot find a sensor that will do this for less than $100. preferably, i'd like to spend less than $30. i can work with a resistive type or voltage type sensor. i just need to be able to make that distinction of material change... any ideas? THANKS!!!

Posted by samurai1200 8 years ago

Do you need liquid mercury?

Do you need liquid mercury? I have 5, one pound bottles of liquid mercury.  These were in dental office cabinets aquired through an estate sale. Not looking to make a killing,  just want it to go to a responsible person. These are in the Detroit Michigan area.

Posted by urdzy 2 years ago

liquid plastic supplies

I need help finding some cheap liquid plastic. It doesn't matter if I can get it online or at a store i just need to find some that isn't insanely expensive. so any help will be appreciated

Posted by General Biscuit 10 years ago

Make your own liquid nitrogen for under $500

Ben Krasnow built a machine that makes liquid nitrogen for under $500. It's made with many parts he bought off of eBay and can generate a liter a day of the stuff at a cost of $1.15 per liter. Check out the link for more info. The first video is from this year's Maker Faire and the second shows the effect of liquid oxygen on a BBQ. DIY liquid nitrogen generator via adafruit

Posted by fungus amungus 8 years ago

Liquid dispenser wireless pour control

Hi guys, anyone knows the concept behind this It is a wireless drink pourer, that can control the liquid flow. Can't find if something like this can be made with Arduino. Does some one have an idea if this can be done?

Posted by justforcavaliers 8 months ago

Can caustic soda and soda ash with sunflower oil and coconut oil be use for liquid soap?

I Need a help can i use caustic soda soda ash and good oil to make liquid soap instead of potash?

Posted by MichaalAddo 3 years ago

liquid motion timers (aka density timers/toys) What's in them?

You know those liquid motion toys you often find at places like Spencer gifts in which a denser liquid (usual bright colored) drips down onto a spiral and you can watch this discrete bubble ride on down? I'm wondering what's inside them and if its feasible to make your own. I've heard lots of things, that the clear liquid is usual a light oil and the colored part is water. I've heard the reverse, I've also heard that there is no water in these things that both are different oils.any help would be appreciated. if your still wondering what im talking about heres a place that sells them :

Posted by SpinningCone 10 years ago

Is it possible to get gas out of a liquid other than by boiling?

Still putting my solar device together and I'm still having some trouble getting the working fluid (ethanol) to boil. Almost there. I was wondering tho if there's not an easier way. Is it possible to by adding heat, make a gas dissolved in a fluid bubble out. Like if you heat up something like pepsi, get all the CO2 to gasify. And, how would you get the gas back in?

Posted by SolarFlower_org 9 years ago

Liquid nitrogen at the doctor

No real point to this but I wanted to post anyways because it is kinda cool.  Went to the doctors office with my wife today because she had this spot on her ear that was bothering her.  Well the doctor wanted to freeze it with liquid nitrogen to get rid of it.  Well of course my ears perked right up because to be honest this was going to be the same time I was even in the same room as this *cool* stuff.  I asked her to pack some up for me to take home.  She laughed and said she wished she could but did not have anything to transport it with.  But she brought in a styrofoam cup about half full of it.  She used a quetip to apply it to the spot on the ear three times.  Then handed me the cup and said "I know the geek inside you wants to play with it.".  Our doctor knows us well.  But the bummer part was that I did not have anything to put in it.  So since the only thing I had to freeze was myself I put the quetip on my finger.  ......Yes this hurt.  But it was still fun.  Then I was left to just watch it boil and then blow on it once in a while.  But when we were leaving I handed the cup back to her since I figured I could not leave with it and it was almost gone anyways.  Then she said something she liked to do with it was to pour it on the floor.  I was pretty cool to watch the "fog" it kicked up and listen to the floor crackle. Anyways, that is my story of the day.  I did not get to do much with it, but it was still *cool*.

Posted by jcaresheets 6 years ago

A custom timed release liquid dispenser....

Hi everybody! How are we all? I'm working on my latest project sending a weather balloon to around 100,000 feet and capturing the journey on camera. I've done it before as you may see on my blog Anyway, my newest project involves making art at around 100,000 feet and this is where you could help! I know this could be done fairly easily but I do not have the knowledge to do it. I need a container that dispenses a small solution of liquid every 15 minutes. Now I've done a lot of research and this is the best I can come up with: It's gravity action, many compartments, on a rotary basis, at timed intervals BUT it will only allow for a few rotations over several hours. I'm looking for 8 rotations over 2 hours. I also checked out water timers but they seem a bit more complex. Maybe you have an alternative idea? Maybe it's 5 minutes of fiddling for you? It feels like to the right person, this should be fairly easy to overcome. I'm based in the UK and if you would like to help me with this project, I'd love it and be really appreciative! It's all good fun and you could see your device hovering at 100,000 feet.... Many thanks, Josh Update- Another vital thing I forgot to add is that this device needs to weigh under 200 grams.

Posted by JoshingTalk 6 years ago

Is such water cooling gonna be good enough ?

I would like to make water cooling for laptop. But not sure if it will cool good enough, tell me what you think. I'm thinking to use copper tube, plastic tubes, some reservoir. In reservoir should be wave maker for aquarium (like this one:;_rd_s=lpo-top-stripe-1&pf;_rd_r=03QDBA7BQG1ZPRCY7GAP&pf;_rd_t=201&pf;_rd_p=1944687582&pf;_rd_i=B013Q5RTFO) for quiet (without noise) water circulation through a tube.

Posted by RoS9 2 years ago

Arduino-Driven Multiple Liquid Dispenser

Hi all! I'm looking to find an Instructable for an Arduino-driven multiple liquid dispenser.  So for example, let's say I wanted to test 100 different combinations out of 20+ liquids (juices?).  I want to be able to push a button, and that dispenses x-liquid of a-volume, and then I push another button that dispenses y-liquid of b-volume using an electric dosing/metering pump into a main mixing reservoir. Something like the Bartendro, except on a semi-precised millileter scale? Thanks!  - Bryan

Posted by bryanquocle 3 years ago

How to make a milk dispenser?

Im looking to build something like a milk dispenser where the milk can be sent through a tube and opened with either a spigot or a handle. It could also be something similar to a box of wine, where the wine is in a bottle, and flows when the spigot is opened, but I would like to know how I can have it so that it comes through a tube when opened. Is it possible to create something that will pull the milk when exposed to air? thanks for any ideas! If these plans are already made or something similar, can someone send me a link? thanks again! Anthony

Posted by lordpyro7 4 years ago

liquid weld

I patched the bottom of an iron pan we use for camping with liquid weld, is it safe to eat food cooked in the pan?

Posted by thinkingtank 3 years ago

Best way to lift a liquid using heat? (SImple pump designs)

I'm overhauling the design of my solar concentrator and now need a good way of lifting a fluid, so as to pour it into a waterwheel and provide rotation. I have a little solar concentrator and boiler to generate heat or steam. What's the best configuration to give as high a rate of flow as possible? I'm hoping for something in the range of 500 ml per minute, rising about 30 cm. I've briefly played around with the attached setup, which is a very basic bubble or airlift pump,  The black is my wheel, the blue a reservoir for the fluid (ethanol), the white is the boiler putting out steam (ethanol vapour) and the light blue is a mix of the liquid and bubbles of vapour which rise up the pipe and re-enter the wheel. It actually works ok, but even optimally only gives a third the rate I'm after. If necessary I can grab some valves from old bike innertubes, or other basic materials if they'll help. My previous design was to have the bubbles of steam going directly into the wheel, which was filled with ethanol. This works but requires heating 3 litres of ethanol to just under boiling. Not impossible but a bit of a hassle. I'm hoping lifting a liquid instead will be a bit easier.

Posted by SolarFlower_org 8 years ago

In Spain, looking for clear teflon tube for a lightpipe.

I guess this question has two parts. I'm prototyping a solar energy device, part of which is a light pipe to transport the collected solar energy, about 300 - 2500 nM. I'm planning on making this from a flexible tube filled with a highly refractive liquid, stoppered at each end with clear plugs. It looks like the materials I should be using are: Tube: Teflon (PTFE, FEP, AF 1600, AF 2400) in that order of desireablitity, lowest to highest. The AF 2400 has a refractive index of 1.29, which is the lowest of any polymer. Apparently. Core: Mineral oil / liquid paraffin. Plugs: Acrylic or normal glass. Thoughts? Also, where would you suggest I try to find these? (I have the mineral oil already) Keeping in mind that I'm in Madrid, Spain. Getting this to work would make a huge difference to solar microgeneration, as transporting the energy is currently a bit of a nightmare. Thanks heaps, Daniel.

Posted by SolarFlower_org 8 years ago

Boiling a fluid to make a inverse water wheel?

Ok, how about this; Submerge a waterwheel type structure with cups facing downwards on one side. Under the cups you have some kind of heating element. The fluid is methanol or some other low boiling fluid. A very small amount of heat from the element will produce bubbles, which rise and are caught in the cups, the wheel turns and can generate electricity or whatever. I'm using this principle in another application, but thought it could be quite an efficient means of generating electricity from heat. If the meths is sitting at forty something degrees and boils around 50, it shouldn't take hardly any energy to tip it over. And since you're effectively generating force from gravity (the weight of the fluid on the other side of the wheel) you're kind of getting ten times your force back. ie producing one litre of bubbles will give you 9.8 Newtons of force (for water, 8ish for meths). So (excuse my dodgy maths) 125 litres of bubbles in an hour would give you 1 kiloWatt hour? One cola bottle per minute, doesn't sound very much and that much energy could easily be produced through concentrated solar. Slight risk of explosion... How efficient do you think it would be, overall?

Posted by SolarFlower_org 9 years ago

My Homemade External Laptop Liquid Cooling System

I did not make an instructable, but i thought you folks might want to see my homemade external water cooling system for my inspiron 5150. it works very well and not a single drop of water has leaked. The average CPU temp drops about 8 degrees Fahrenheit when i use it..

Posted by linkey 10 years ago


Water rockets! Who doesn' t love them. Cheap, easy, safe, fast....

Posted by comodore 10 years ago

absolute zero

I just had a thought, at absolute zero does everything turn into a solid? since nothing's moving would it be a solid? Would gases such as helium solidify at low pressures? Etc.

Posted by guyfrom7up 10 years ago

Would a glass, vacuum-insulated thermos be able to withstand the extreme cold of liquid-air?

I am in the middle of designing a system to produce liquid air using the von linde process. the termos would not be under any pressure, but it will get quite cold. can a thermos using a glass vacuum insulated inside be able to withstand temperatures below -180 degrees celsius?

Posted by pedrogabman 8 years ago

Can a glass, vacuum insulated container withstand temperatures in the -180 degree celsius range?

Is it possible to store liquid nitrogen and oxygen in a vacuum insulated container for a short period of time? i have a thermos that i though might work, but i want to be sure that im not going to have the thermos explode in my face when i try it. this is an old beefy thermos that can take at least 190 degrees celsius, but im not sure about the other direction.  

Posted by pedrogabman 8 years ago

Potassium nitrate as a oxidizer in liquid fuel rocket?

Would potassium nitrate work as a oxidizer in a liquid fuel rocket?

Posted by WastelandWilly 3 years ago

how to make liquid soap for sale purpose

I will be thanks full if any one explane to me how to make liquid hand wash and dish wash ......

Posted by azam7676 6 years ago


What is flame? Is it gas ,solid or liquid?it can't be solid or liquid but it isn't realy gas eather... or is it?

Posted by toogood 10 years ago

How to get liquid gases like hydrogen, xenon, etc.

Come on people, not all of us can snap our fingers and get liquid nitrogen for various purposes. HELP US! give us a link or something, fellow robots, blokes, etc.

Posted by szechuan53 10 years ago

Dry Freezing.

 Can you dry freeze something when its a liquid?    could you take a liquid solution and submerse it in dry ice to dry freeze it?

Posted by ERCBIENG 8 years ago

2013 Pre-Maker Faire Ice Cream Social!

In town for the Bay Area Maker Faire next weekend?  Come to our annual Liquid Nitrogen Ice Cream Social! There will be: Liquid nitrogen Ice cream made with liquid nitrogen Pizza (not made with liquid nitrogen) Beverages (possibly made with liquid nitrogen) Authors and other interesting people (playing with liquid nitrogen) Also, we may have some liquid nitrogen When:  5-8pm, Thursday, May 16, 2013  Where:  Instructables HQ, 82 2nd St, SF, CA (look for the big robot on the window!) Come see our lab, meet some amazing people, eat pizza and ice cream, meet the Instructables team, and take advantage of your last chance to really decompress before the craziness that is Maker Faire. If you can make it, please RSVP to: LN2 @ (     <-- slightly obfuscated to avoid spambots! so I can order enough pizza for the crowd!   We're looking forward to meeting you! Christy and the rest of the Instructables team

Posted by canida 5 years ago

Science Fair idea: Bouncing Liquids

Here's an idea for the science fair: Bouncing liquids. Explain how it works and do something cool with it! bounce againJumping jets move from the bathroom to the kitchen.After bouncing shampoo, physicists now bring you bouncing cooking oil. A team in Texas has found that the trampolining of a liquid jet falling onto a bath of the same liquid is more common than expected.Last year, a group in the Netherlands studied this bouncing effect for a jet of shampoo (see 'Puzzle of leaping liquid solved'). The bounce, which was first reported more than 40 years ago, happens because of the peculiar nature of shampoo, which gets thinner (less viscous) as it flows. A jet of it hitting a liquid surface is therefore lubricated by a thin layer at the interface, enabling it to bounce off rather than merge.But the liquids now studied by Matthew Thrasher and his colleagues at the University of Texas in Austin don't have this property. The silicone oils in their experiment are viscous but have 'normal' flow behaviour, like water.The researchers directed a jet of oil vertically onto the surface of a tank of the same oil. They found that the jet could undergo both a 'leaping' rebound and a bizarre 'flat' bounce in which it sprang horizontally across the liquid surface.The bounce here is due to a thin layer of air that separates the two liquid surfaces, the researchers say in an article submitted to Physical Review E.They point out that the effect can easily be recreated in a kitchen experiment with cooking oil. Just fill a glass pie dish with about 4 centimetres of oil and pour onto it a thin stream from a cup about 3 to 6 centimetres above the surface. While pouring, move the stream in a circle about once every 2 seconds (or perhaps less messily rotate the dish on a Lazy Susan). The bounce can be encouraged by passing a chopstick or some other small rod through the stream every now and then.

Posted by ewilhelm 11 years ago

Looking for micro pump for steampunk liquid-cooled laptop tray

Anyone with an aluminum powerbook knows how scary-hot the get during a dvd rip. My solution is a steampunk liquid cooling tray. It would have a copper plate with a thin liquid reservoir just under the centre, where the processor is, with brazed copper tubes emanating outward under the tray. But to keep the tray thin, I can't take advantage of the natural upward flow of the hot liquid and I want to avoid radiators hanging out the back or sides. I figure I need a wee pump to push the liquid out to the outer edges to cool. Running off the USB of course! I've seen the one made from a phone vibrator, a pen and some tubing. That'd work, i suppose. Does anyone have any suggestions on where to find a low voltage micro/nano pump? As for the USB, I found a mini voltage converter here. I can handle the design, it's the technical (esp. electrical) aspects that make me stumble. Any help would be so appreciated.

Posted by jodybaker 11 years ago

Portable Book Scanner, Blooming Onion, Liquid Cooling with Car Parts

  Portable Book Scanner Blooming Onion Liquid Cooling with Car Parts Build a Helmet Homemade Snickers Recipe Pallet Hanging Chair Lego Camera Remote Waterproof Fire Starter Remove Scratches from a CD Crystal Nightlight Prank Contest Winners Cheap Low-Profile Bed Frame Soft iPhone Stylus Minimalist Running Sandals Jar Clock

Posted by randofo 8 years ago

Liquid Plastic

I work at a BSA summer camp each year teaching archery and a little class about things not to bother while at camp. I have to find these bugs/spiders each year and catch them at some risk. I would like to have a perm. display for them to look at with out having to worry about me or them getting bit. I have did a search for said bugs on line but found nothing. Does anyone know how to use the liquid plastic to encase bugs? Please email me at Thanks.

Posted by Shenanigans 10 years ago

Centrifuge forces

Does anyone understand the different RPMs in centrifuges that will separate liquids from solids, such as Sea Salt out of Sea Water?

Posted by SeaCub 8 years ago

Bee Problem

Anyone Know How To Make A Liquid That Attracts Bees? Because I Use A Mixture Of Sugar Water & Flavoring And It Doesn't Work To Well So Can Anyone Help.

Posted by Twilight 10 years ago

Food safe pump

Hi everyone! I'm working on a halloween costume where I want to have a container of liquid on my back, a hose from said container running down my left arm and a way todispense the liquid through the hose. Right now the dispensing is the problem. Would a windshield washer pump be reasonably safe to use for something that is going to be consumed? I'd buy a new unused one of course. If that's not a good idea, what would be? I've experimented with a can of compressed air to push the drink out but was not fully satisfied with the result.

Posted by Jur 4 years ago

Any Suggestions?

So I recently did an instructable on Liquid Light emulsion, (a darkroom technique for printing on objects, link posted below).  I'd like to do more projects with this, though I think it may take  some time.  But while I'm gathering my materials to make a darkroom, I was wondering if anyone had any suggestions of what I should print the images on or what images you think would look cool.  HELP!!

Posted by KathyTackettPhoto 5 years ago

Can Anybody Top this Crazy Green Idea?

What is it? it's the side view of a solar peaking plant. With PV panels on the roof of a giant structure that would produce liquid air during periods of low demand, and augmented by solar work like a big energy storehouse that would be called upon during peak demand. During peak demand the liquid air would be vented into the atmosphere, causing it to snow in the desert in the summer.  It could also cause the formation of a permanent snowpack downwind of its' location.  

Posted by Mud Stuffin 5 years ago


Hello everybody!  I'm interested in do something like the table in the videos. But my problem is that I don't know which materials are used to make the protection and the liquid. I think that the protection is made using a type of plastic polymer, but I don't know which. Because it has to be very tough. And the liquid I think that maybe it would be water with some black coloring and with some thickener for make that effect. I hope that someone could help me. Thanks in advanced.  

Posted by JaUmE_88 6 years ago

Liquid Cooling - Body

Its so hot and... well.... I made a device to cool myself down! I might make an instructable, but basically, I took two 20oz bottles with caps, poked 2 holes in the top of one, 1 hole in the other. I then ran tubing between the two, and in the bottle with 2 holes, I added a bit of tubing to put the air intake below water level. I filled the 2'holer up with icewater, and blew a bit on the air intake to get it started. It works very well, to say the least! :P

Posted by zachninme 10 years ago

Easy spray/liquid *open cell* foam?

Hi all - new here  :)  I was trying to think of where I could ask this and I immediately thought of instructables.  Does anyone have any ideas where I could find a spray or liquid *open cell* foam?  It's easy to find cans of spray closed-cell foam these days, but I've never seen one for open cell foam.  I've done a lot of searching, and the only open foam cell solutions I find tend to be giant expensive things for insulating houses in bulk, nothing for small scale applications.  I'm looking to fill a bundle of relatively fine tubes (diameter TBD), which I want to act as a sponge on the inside, resisting allowing the liquid inside to drain out while still allowing for gas migration.  Hence closed cell is not an option.  Polyurethane is probably fine, although other materials may well be fine as well. Any ideas?

Posted by KarenP139 1 year ago

safety valve bbq propane

I understand the pressure relief valve. I understand the float valve which prevents overfilling. But is there any mechanism to prevent liquid propane from leaking if the tank tips?

Posted by Toga_Dan 2 years ago

Copper Crystal Metal

Hi, Please assist. I am looking for ways to create copper crystals from copper sulfate liquid by using chemicals only. I found a company in South Africa that's doing exactly that.

Posted by CrystalCopper 5 years ago


I have a bag of dried cayenne peppers lying around here somewhere. Is there any way i can extract the oils to make a kind of spicy fire liquid? What solvents (isopropyl? denatured alcohol? acetone?) would dissolve the oils? Thanks.

Posted by John Smith 10 years ago

working with closed cell foam

I am making a clown prop. I have a pair of dry wall stilts that I have attatched closed cell foam to and carved into the shape of bare feet. It was my entent to coat the foam with liquid latex for durability. The foam when shaped and sanded left undesirable open pores, I next filled the pores with flexable latex caulk and then started coating with the liquid latx. I am not happy with the results I am getting, the foam is still to bumpy and the added weight of the caulk may be a problem. I am contemplating starting over with another product. I know that foam board used in the housing industry would be easer to sand smooth, and is there a differant coating that would be easer to apply. Thanks Rick "Locco"

Posted by bridgetleeryken 10 years ago

70-note "Bottle Organ"

Here's one for you... I'm looking to create a 70 note bottle organ, inspired by this video: Except I'm wanting to build mine in a more "automatic" state - played via MIDI notes, an arduino and lots and lots of solenoids making spoons hit the bottles.. That side of it I've got covered thanks to other excellent instructables which have taught me a lot about micro electronics. What I am currently trying to work out is if there is a way to change the pitch of bottles in any way except simply adding water. Would another liquid achieve the same results with less "spill risk"? Does it even need to be a liquid? I'm guessing it needs to be a liquid as I believe the physics of the noise made when a bottle is struck is based on the water absorbing vibrations, making them slower and lowering the pitch. If anyone has experience tuning multiple bottles to be struck as an instrument then please do reply! Alternatively if anyone has any novel suggestions for things which would be easier to persuade 70 notes out of then please also reply! End goal - be able to play flight of the bumblebee at full speed with chords and out-nerd the guys in the video. Ideally on bottles. Many thanks! Leo

Posted by frag_me 7 years ago

I can't figure this out.

I have 5 hours tommorow to do anything. I have an odd urge to build a giant dixie cup(see picture) after see an e-mail sant by a relative. I need it to be water proof but still hold liquid. Anyone have any ideas?

Posted by ry25920 10 years ago

Solution to turning on/off gas: new pump design.

I've been working a couple weeks now on solving the problem I posted here on how to improve my pump design by alternating the feed of ethanol vapour. I got good feedback but ultimately all the solutions involved mechanisms which were going to be somewhat tricky to build and source, which is against the brief of the project I'm working on; being an open source solar tracker concentrator makeable from scrap. In the end I solved the problem by largely redesigning the whole pump. Since it's driven by boiling ethanol, rather than add an extra mechanism for turning the feed of vapour off and on, I reduced the amount of ethanol being boiled, so that it boils itself out after an appropriate period. The vapour is then able to collapse fully, which sucks in more liquid ethanol and refills the system. 1. At the bottom right is the boiler, which holds about 2-3 ml ethanol. 2. This boils and the vapour enters the 'chamber' (the half blue, half white (liquid and gas)), forcing out the liquid, which pours into the wheel, ending up in the main reservoir. 3. This continues until the eths in the boiler has boiled away to the extent that it can no longer overcome the rate of re-condensation in the chamber, which starts to suck, so to speak. 4. This draws liquid from the reservoir, which passes through the boiler, shutting off the boil, the pressure drops quickly and the chamber and boiler refill with liquid. 5. Two valves (the only moving parts, besides the wheel) keep all this going in the right direction. 6. Repeat. The wheel provides the motion for the solar tracker. It's not in by any means powerful or efficient, but the whole thing can be made from a bit of metal tube, some thin pipe, a glass jar and two valves from bike inner tubes (plus a paint tin, bike wheel bearing and some drinks cans for the wheel). I haven't had a chance to try it in the field yet, but powered by a candle it seems to work fairly well. Blog entry here, will post photos and videos when available.

Posted by SolarFlower_org 8 years ago