Why cornstarch and ketchup defy physics

Solid or Liquid? Non-Newtonian Fluids Can a substance behave both as a solid and as a liquid? It's usually pretty easy to tell if a substance is solid or liquid. We take it in our hands for an assessment, if it flows, we call it liquid. If it does not flow and stands firm, we can classify it as solid. But this distinction is not always easy. Today we are going to discuss a confusing fluid group that changes its form under pressure.

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