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What did Cavendish describe in his paper "On Factitious Airs"?

  • Density of "inflammable air"

  • The process of photosynthesis

  • The properties of helium

  • The structure of the atom

Answer

Cavendish measured the density of "inflammable air" (which we now know to be hydrogen) and found that it was 1/14th the density of air. This led him to conclude that hydrogen was a very light gas.
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