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What is the lightest substance known?

March 11, 2017 | Author: | Posted in Science

The element hydrogen is the lightest substance known to science. Its specific gravity, compared to air, is 0.0695. Helium, with a specific gravity of 0.139, is the next lightest substance. Specific gravity is relative density, that is, the ratio of the weight of any volume of a substance to the weight of an equal volume …

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