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  4. Helium or hydrogen

Helium or hydrogen

We have found the following answers matching the query 'Helium or hydrogen' in our database: For more stats and recent usage scroll down and continue reading. Helium or hydrogen crossword clue was last seen on May 8 2022 in the popular USA Today Crossword.

RankAnswerCluePublisher
99%GASHelium or hydrogenUSA Today

Definition

• An aeriform fluid; -- a term used at first by chemists as synonymous with air, but since restricted to fluids supposed to be permanently elastic, as oxygen, hydrogen, etc., in distinction from vapors, as steam, which become liquid on a reduction of temperature. In present usage, since all of the supposed permanent gases have been liquified by cold and pressure, the term has resumed nearly its original signification, and is applied to any substance in the elastic or aeriform state.
• A complex mixture of gases, of which the most important constituents are marsh gas, olefiant gas, and hydrogen, artificially produced by the destructive distillation of gas coal, or sometimes of peat, wood, oil, resin, etc. It gives a brilliant light when burned, and is the common gas used for illuminating purposes.
• Laughing gas.
• Any irrespirable aeriform fluid.

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