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This is a vial containing ultrapure hydrogen gas.
This is a vial containing ultrapure hydrogen gas. Hydrogen is a colorless gas that glows violet when ionized.Wikipedia Creative Commons License
Protium is the most common isotope of the element hydrogen. Protium has one proton and one electron.
Protium is the most common isotope of the element hydrogen. Protium has one proton and one electron, but no neutrons.Blacklemon67, Wikipedia Commons
NGC 604, a region of ionized hydrogen in the Triangulum Galaxy.
NGC 604, a region of ionized hydrogen in the Triangulum Galaxy.Hubble Space Telescope, photo PR96-27B