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Physics · L2 · Why a Metal Jar Lid Loosens With Hot Water

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The chain of reasoning behind a classic kitchen trick for opening a stuck jar.

by @openstemUpdated Physics
Stuck metal lid on a glass jarRun hot water over the lidMetal lid heats and expandsGlass jar heats and expands too, but lessLid grows more than the jar openingGrip loosens — lid twists off easily

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