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400 year-old mystery of Prince Rupert's drops finally cracked

Follow @physics_unplugged | video description 👇 A Rupert’s Drop forms when molten glass is rapidly cooled in water, causing the outer layer to solidify quickly while the inside remains hot. As the interior cools and contracts, it pulls on the outer shell, creating extreme compressive stress on the surface and tensile stress inside. This stress distribution makes the head incredibly strong, allowing it to resist hammer blows. However, the tail is under high tension, so even a small crack there c

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