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Short answer: This is normally done when a lid is too tight to unscrew. Placing the lid in warm or hot water loosens the lid a little so someone can get to the contents of the jar easier.
Long answer: Metal reacts to heat at a lower temperature than glass does. When a metal lid is placed in warm or hot water, the lid expands outwardly from its center. This will cause the lid to loosen its grip on the jar making it easier for a user to unscrew the lid. It's simple science and a neat trick.
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∙ 14y ago
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