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if your doing apex this answere wont help:

the particles in a plastic lid are bouning around at a certain speed keeping it in its form . when its warmed however, the particles move much faster making it expand because theres more room between particles. when its cooled the particles bouncing start to slow down retracting back to its original form

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Q: Why would a plastic lid on a food container shrink after it is warmed then cooled?
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