7 dic 1905 año - Helium is discovered in Natural Gas

Descripción:

Hamilton Cady and David McFarland from the University of Kansas discovered that helium could be found in natural gas. They proved that helium was not one of the rarest elements on Earth. The gas was later used in blimps for WWII.

https://www.acs.org/content/acs/en/education/whatischemistry/landmarks/heliumnaturalgas.html

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