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Heavier than tungsten lighter than osmium?

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Is Ozone heavier or lighter than air?

Ozone is heavier than air. Ozone is found in the upper atmosphere, because it is made "up there", and decays back to oxygen before it can fall very far.

Is tungsten heavier than gold?

Yes. According to most sources, tungsten is a bit heavier than gold. It is definitely much more durable/strong also.
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Is iceberg heavier or lighter than water?

The weight is dependent on the volume, so in order to answer that question you'd have to know the volume of both the ice and water. Therefore it's not really possible to answe