Oxygen
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Oxygen is a chemical element; it has the symbol O and its atomic number is 8. It is a member of the chalcogen group in the periodic table. It is highly reactive, a nonmetal, and a potent oxidizing age
Liquid oxygen (O2 at below −183 °C)
Among several contemporaries who had made discoveries independently from one another, Joseph Priestley was the first to publish his findings on oxygen.
Antoine Lavoisier discredited the phlogiston theory.
Robert H. Goddard and a liquid-oxygen–gasoline rocket
Hydrogen
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Hydrogen is a chemical element; it has the symbol H and atomic number 1. It is the lightest and most abundant chemical element in the universe, constituting about 75% of all normal matter. Under stand
Purple glow in hydrogen's plasma state.
Robert Boyle, who discovered the reaction between iron filings and dilute acids
Antoine Lavoisier, who identified the element that came to be known as hydrogen
The Hindenburg over New York City in 1937