Spatulatta: Cooking 4 Kids Online

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Olivias Oobleck Print E-mail
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This is not a snack but we thought it would be good for a rainy day or after school. Oobleck is weird stuff and fun to play with but...

DO NOT POUR IT DOWN THE DRAIN!! It will totally stop it up.

Ooleck is called a 'non-Newtonian' substance because it does not behave the way things are supposed to behave according to Newton's Third Law of Motion. The law says "for every action, there is an equal and opposite reaction."

This means that when you smack the oobleck, you would expect it to splash like a liquid...but it doesn't. It becomes hard like a solid for a couple of seconds.

Whoa! Why is that?

Here's the technical answer we found on Teachernet.com. Scientists say "the uncooked corn starch particles are structured in both crystalline and noncrystalline arrangements. When slowly mixed with water, the noncrystalline structures of corn starch absorb most of the water. When you smack or stir it rapidly, you increase the temperature and pressure on the mixture which causes more noncrystalline structures to form.

These new noncrystalline structures absorb more water and the mixture becomes thicker: hence the appearance of a solid. When you discontinue the pressure, the number of noncrystalline structures decrease and water is
released, creating the 'soupy' mixture."

Wild!

This recipe makes one really fun mess!

You'll need:

  • 1/2 cup cornstarch
  • 1/4 cup water
  • A little adult help

Equipment:

  • Plastic wrap
  • Measuring cups
  • A disposable bowl
  • A flexible spatula
  • A spoon
      1. Cleaning up after we made the oobleck was quite a job! So learn from our mistake and put a little water on the counter and lay down some plastic wrap first.
      2. Slowly stir the water into the cornstarch. If you stir too fast the spoon will get stuck.
      3. Once you get the oobleck to a smooth consistency you can start to play. Try squeezing the oobleck in your hand and then quickly releasing it. With a little practice you can make a ball that holds solid for a second then melts.
      4. When you're done, peel as much oobleck off your hands into the bowl and pitch the bowl in the garbage can. Remember that temperature and pressure make the oobleck turn into a solid so DON'T POUR IT DOWN THE DRAIN!!