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Is a kilo of feathers heavier or a kilo of rocks?

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Their weights are identical. The main difference is their volume as feathers are much less dense that rocks so 1kg of feathers fills a much larger three dimensional area. read more

One kilo is the same regardless of the objects in question, hence a kilo of rocks or feathers is equal. if you asked, which is heavier a bag of rocks or a similar sized bag of feathers, I would go with rocks. read more

I suppose, as an implication of the above fact, if you wanted to have a kilo of lead be heavier than a kilo of feathers, you could, say, put the kilo of lead on Earth and put the kilo of feathers on Mars. read more

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