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The Mould Effect is a phenomenon where a falling chain forms an upward ‘fountain’ before dropping. It occurs because the falling chain gains momentum that pulls the next links upward, creating a temporary arch before gravity pulls them down.

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How can a falling chain fountain upward?✍️ h2/h1 = α / (1 - α - β) This is the Mould Effect. Because the chain links are rigid, pulling one end up causes the other to pivot and push off the stack. This downward kick creates the upward force that makes the chain leap out of the jar! The higher the drop, the higher the fountain.

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