Someone reminded me of that wife’s tale where it takes a crane to remove a mattress from a pool and that itself reminds me of how sometimes removing certain floaties from the pool could be needlessly hard at times while super easy other times. Why does this happen?
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I don’t really understand your questions but if your asking why a mattress filled with 100 gallons of water is heavier than a floatie filled with weightless air it’s because water is heavy and air is not heavy. If your asking why things are less heavy underwater it’s because gravity and buoyancy make things seem weightless under water
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