Gas is a  notion introduced by Jan Baptist van or von Helmont M.D. (1577-1644), a prominent Belgian (Flemish) physician and pioneer physiologist called the "father of pneumatic chemistry" - he demonstrated that the air (ether) is distinct from other "gases" such as carbon dioxide emanating from burning charcoal or fermenting plants. Anton-Laurent Lavoisier (1743-1794) called the "father of modern chemistry" expanded the field by isolating and naming oxygen and a systematization of the chemical nomenclature.

Ether, air, chaos, gas, caotic mind or madness, atmosphere, ether and earth, gea, Gaia, noise ... share and enrich the notions inherent in each term (please see some of the links below and other in the arrays harbored within Pandora's contents)

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