Imag it 14 - 20101204 - Oobleck

How to make Oobleck

[dropcap1]O[/dropcap1]obleck is a suspension of cornstarch and water that can behave like a solid or a liquid depending on how much pressure you apply. Try to grab some in your hand and it will form a solid ball in your palm just until you release the pressure, then it will flow out between your fingers. Materials that behave this way are classified as non-Newtonian liquids because their flow properties are not described by a constant viscosity.  The name Oobleck comes from the 1949 children’s book, Bartholomew and the Oobleck, by Dr. Seuss. In the story a sticky liquid falls from the sky as a result of the king becoming bored with normal weather.

One thing to keep in mind is that Oobleck is a suspension, not a solution. The cornstarch does not dissolve in the water like salt or sugar would. Instead, the tiny starch particles are suspended in the liquid. If you let it sit long enough in a glass, the cornstarch will settle to the bottom leaving a layer of clear water on the top. This is why it is very important to not pour Oobleck down the drain. Should (or rather when) the suspension separate in your drain pipes, you will be left with a hard clump of cornstarch that will block the drain. The best way to get rid of you Oobleck is to simply put it in your trash can.

Recipe for Oobleck

To mix up some Oobleck grab a box of cornstarch, some water and a mixing bowl. In general, a mixture of about 1.5 cups of cornstarch to 1 cup of water is a good starting point. You will have to tweak these amounts to get the perfect mixture. Keep in mind that the mixing process can get messy so be prepared to clean up.

  • Cornstarch
  • Pitcher of water
  • Aluminum pie pans
  • Measuring cups
  • Mixing spoon
  • Newspaper for covering tables
  • Food coloring or tempera paint (for fun)

Pour the cornstarch into a large mixing bowl and slowly add the water. You are shooting for a mixture that feels kind of like honey and tears a bit when you run your hands across the top. You will have to experiment with more or less cornstarch or water until you get the right mixture. If you want to color your Oobleck add some tempera paint. You can use food coloring if that’s all you have on hand. Food coloring tends to stain more than the paint, especially if you have a spill while preparing your Oobleck.

What does non-Newtonian mean?

All fluids have a property known as viscosity that describes how the fluid flows – commonly thought of as how thick or thin a fluid is. For instance, honey is much more viscous than water. When a fluid’s viscosity is constant it is referred to as a Newtonian fluid. Oobleck is an example of a fluid whose viscosity is not constant, it changes depending on the stress or forces applied to it. If you poke it with your finger and apply a large force, it becomes very viscous and stays in place. If you gently pour it, applying little force, it will flow like water. This kind of fluid is called a dilatant material or a shear thickening fluid. It becomes more viscous when agitated or compressed.

Another non-Newtonian liquid is ketchup. Ketchup behaves in just the opposite way from oobleck. It becomes less viscous when agitated. Liquids like this are called thixotropic. If you leave a bottle of Ketchup on a shelf, it becomes thicker or more viscous. Nearly everyone has experienced this while trying to pour the liquid from a new bottle – it refuses to move. If you shake the bottle or stir it up it becomes less viscous and pours easily.

Why does Oobleck behave the way it does?

The most generally accepted explanation for the behavior of Oobleck is offered by Cary Sneider in “Oobleck: What do Scientists Say?”. When sitting still the granules of starch are surrounded by water. The surface tension of the water keeps it from completely flowing out of the spaces between the granules. The cushion of water provides quite a bit of lubrication and allows the granules to move freely. But, if the movement is abrupt, the water is squeezed out from between the granules and the friction between them increases rather dramatically.

Experiments to try

The first thing you have to do is simply place your hands into the Oobleck and start squeezing it. Have some fun! Try to make a ball by moving it around quickly in your palms. Once you stop applying pressure to the mixture it will flow out of your hands like a liquid.

Try filling a pie plate with a think layer of Oobleck and then slapping the surface with your open hand. Because of the dilatant properties, becoming more viscous when a force is applied, the liquid will all stay in the plate. Try the same experiment with water and compare the results!

If you have a lot of cornstarch and a small pool (or a large one like in the video) you can supersize this experiment. Since the liquid becomes more viscous when pressure is applied you can actually walk or run on the surface without sinking. Of course, once you stop moving you will begin slowly sinking into the liquid.

Another fun experiment is to fill the cone of a speaker with some Oobleck. Connect the speaker to a low frequency sound source and watch as the Oobleck seems to come alive. Typically low frequencies get the fluid up and moving better than higher pitched sounds. A plastic subwoofer works the best, or you can use a sheet of plastic wrap to protect a paper cone speaker.

41 replies
  1. Sue
    Sue says:

    This stuff is great especially with my pre-kindergarteners. They just don’t understand how it works! We did it after reading the story.

    Reply
  2. morgan
    morgan says:

    Hi my name is morgan i made Oobleck in 2 and 3 both times wer fun the firt time my Oobleck was green the sekin time i mist bluw e and green and red and it ternd green ish graye ish thank you for lisning.

    Reply
  3. Gavin
    Gavin says:

    oya!!! ive done this tons of time this is the best recipe for oobleck i dont know why but its kind of addicting to play around with… good luck people on making this fine substance

    Reply
  4. julia gillenwater
    julia gillenwater says:

    im only a frist grader and during sience time we made oobleck
    cuse my teachers husbend came in and read our class the book
    and then when the book was over we made oobleck it was fun! george in my class he is a boy hes a lareist i can amitit justtomarrow im going to tell him to haha i really will im sare
    that i won.t probly write me back! if your any grade frist second third fourth fith sixth seventh eihth of all the way till
    college, peace!

    Reply
  5. Jojordan
    Jojordan says:

    This is the coolest thing in the world. Then I put it on my tramp it went so high it went over the net and landed on the hot tube. Then I tried it with my friend, and it landed on both of our heads!!!!!!!!!!!!! LOL

    Reply
  6. Misty
    Misty says:

    I made oobleck in the 4th grade it was too fun! I got to hit it with my fists and then I got to put some in my hands roll it into a bal then let it slip out of my hands! It was really fun and super cool!! Back then it was totally mind blowing! :D Just a shout out to the awesome teacher who surprised us with the oobleck! Thanks Mrs.Lay! You were an aweosme 4th grade science teacher!!! And thanks Mrs. Finkbeiner and Mrs.Daniels!! Mrs.Fink you made math fun! And Mrs. Daniels you were a great reading teacher! WooHoo! :) Sorry off the subject but oobleck is great and my mom and me are making it again soon! :D :D :D :D :D

    Reply
  7. laraibqazi
    laraibqazi says:

    it was too fun I like……… it the scientist discoveries r so much good I also want to be the scientis…………..t

    Reply

Trackbacks & Pingbacks

  1. […] great website that tells about the science behind this interesting stuff, which can be found here :http://sciencecafe.org/content/2008/12/22/how-to-make-oobleck/ And parents, Oobleck is not so friendly for your drainpipe, so when you have finished playing with […]

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