wich material is the most dense air water plastic or iron

Iron is more dense.

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iron

I am the one who asked this Q.

iron

Iron is the most dense, since density is the thickness of something. Air is not thick, since we breathe it in, and water is not thick, it is simply little droplets. Plastic is also not thick, since it is not heavy, but iron, iron is very much so dense, since it's thick and it can sink easily, since it is thick and heavy!

Iron?

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iron

IRON