Valentine Oobleck

What’s better than Oobleck? Valentine Oobleck! But seriously Oobleck just doesn't ever get old and the science behind this liquid that sometimes acts like a solid is pretty dang cool. Oobleck is a non-Newtonian fluid, meaning it doesn't follow Newtons law of viscosity, which states that the viscosity (thickness of a liquid) will not change under pressure. That is not the case with Oobleck, when you squeeze it (ie. apply pressure), it hardens, and when you release your grip (ie. remove the pressure) it flows off your hand.

Supplies & Instructions

2 cups cornstarch

1 cup water

Valentine items (foam balls, acrylic hearts, plastic necklaces, feathers)


Add cornstarch to the deep tray, then slowly add water while you mix. If the mixture is too thick, add small amounts of water until you have a nice smooth consistency. Place the valentine items on top of the oobleck.

Cleanup Tips: Use a flour sack towel under the tray for quick cleanup. Then use a damp cloth to wipe up any excess. Don't worry if you missed any on the floor it can be easily swept up once it's dry.

Preschool Prompts

Close your eyes and describe the oobleck using only your sense of touch. What do you think will happen if you try to squeeze the oobleck? How does what happen compare to your prediction? What was the most difficult/easiest item to remove? Do you think it would be easier to remove the Valentine items from water or oobleck? How can we test this? When you pour the oobleck does it behave like a solid or a liquid? How can you make it behave like a solid?

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