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Which is the lightest metal that acts opposite to gravity ?

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It is not possible for any metal (or anything for that matter!) to act opposite to gravity.
Everything has a weight (effect of gravitational pull on a mass), and is pulled towards another mass (in this case Earth) but many things are ligher than air, so they will float away from the earth until the air becomes so thin that its boyant effect is no longer stronger than the gravitational effect, and the objet can rise no further.

Posted on Nov 04, 2010

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