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1. If the jar had been previously open, the inside of the lid or the screw area of the jar may have gotten moist from the material in the jar. Putting the jar back in the refrigerator will cool the material on the lid making it less viscose (thicker) and possibly stickier making it harder to separate the lid from the jar.

2. Putting a jar in the refrigerator will make it colder. Because of the physical properties of metal and glass or plastic, the cold will make the metal lid contract/shrink more than the rest of the jar. Although the degree of shrinkage is very small, it could be enought to tighten the lid around the jar making it harder to remove the lid.

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11y ago

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