What is happening on a molecular level when an elastic stretches? Why are some substances elastic but others are not?
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Everything is elastic. If you put a flea on a slab of granite and measured it very precisely, you’d see the granite flex and come back when you remove the flea. It’s just that the amount of force something can take before it breaks or permanently deforms is different for every material. In the case of something like a rubber band, it can take a lot of stretch before it permanently deforms or breaks
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