Oobleck, a substance made from cornstarch and water, behaves as both a liquid and a solid depending on how it is handled. This material offers engaging play and learning opportunities. With proper care, oobleck can be preserved for repeated use, and this article details methods for extending its lifespan and ensuring responsible disposal.
The Science Behind Oobleck and Its Lifespan
Oobleck is a non-Newtonian fluid, meaning its viscosity, or resistance to flow, changes with applied stress. This behavior arises from the cornstarch particles suspended in water. When a sudden force is applied, such as a quick tap or squeeze, the particles are forced together, creating friction and causing the mixture to temporarily behave like a solid.
Conversely, when pressure is released or applied slowly, the cornstarch particles slide past each other with the water, allowing the oobleck to flow like a liquid. Water content is important for this balance. Evaporation causes oobleck to dry out over time, leaving only the cornstarch powder and eliminating its fluid properties. Additionally, because it contains water and organic cornstarch, oobleck is susceptible to mold growth, which shortens its usable life.
Best Practices for Storing Oobleck
Storing oobleck in an airtight container is important to prevent water evaporation and maintain its unique properties. A sealed plastic container or resealable bag works effectively.
Room temperature is suitable for short-term storage, up to 24 hours. Refrigeration extends its life by slowing evaporation and microbial growth, allowing oobleck to last for up to two weeks. Freezing can also halt bacterial and mold growth, preserving it for longer periods. If oobleck thickens after storage, adding a small amount of water and mixing it can restore its original consistency. Maintaining cleanliness by using clean containers and hands helps prevent contaminants that could lead to premature spoilage.
Reviving and Disposing of Oobleck
If oobleck has completely dried out, transforming back into a powder, it can be revived. Simply add water gradually, mixing until the characteristic non-Newtonian consistency is regained. This method is effective as long as the material has not developed mold, which indicates it should be discarded.
Proper disposal is important to avoid plumbing issues. Oobleck should never be poured down drains, as it can solidify and cause significant clogs. The most responsible way to dispose of oobleck is to scrape it directly into the trash. Alternatively, it can be allowed to dry completely in the open air, then swept up as powder and placed in the trash or composted, as it is biodegradable.