Hydrogen is a chemical element with the symbol H and atomic number 1. It is the lightest and most abundant element, constituting about 75% of all normal matter. The Sun is mainly hydrogen in a plasma state. Under standard conditions, hydrogen is a gas of diatomic molecules with the formula H2; it is colorless, odorless, non-toxic and highly combustible. On Earth, hydrogen can exist in its gaseous state and in molecular forms, such as with oxygen in water (H2O). The most common isotope of hydrogen (1H) consists of one proton, one electron and no neutrons. Hydrogen gas was first produced artificially by the reaction of acids with metals. Henry Cavendish, in 1766–1781, identified hydrogen gas as a distinct substance and discovered its property of producing water when burned; its name means water-former in Greek. Its main industrial uses include fossil-fuel processing and ammonia production for fertilizer. Emerging uses for hydrogen include the use of fuel cells to generate electricity.
Read more: <https://en.wikipedia.org/wiki/Hydrogen> _______________________________ Today's selected anniversaries: 1622: Fifty-five Christians were executed in Nagasaki during the Great Genna Martyrdom, part of persecution towards Christians in Japan by the Tokugawa shogunate. <https://en.wikipedia.org/wiki/Great_Genna_Martyrdom> 1858: George Mary Searle discovered the asteroid 55 Pandora from the Dudley Observatory near Albany, New York; it was his only asteroid discovery. <https://en.wikipedia.org/wiki/55_Pandora> 1945: Mike the Headless Chicken was decapitated on a farm in Colorado; he survived another 18 months as part of sideshows before choking to death. <https://en.wikipedia.org/wiki/Mike_the_Headless_Chicken> 2009: Members of the Atlanta Police Department conducted a raid on a gay bar, with patrons later alleging that their constitutional rights had been violated and the city agreeing to pay over $1 million in settlements. <https://en.wikipedia.org/wiki/Atlanta_Eagle_police_raid> _____________________________ Wiktionary's word of the day: posterize: 1. (transitive) 2. 3. (graphic design, photography) To inadvertently or intentionally reduce the number of colours in (a photograph or other image), changing a continuous gradation of tone to several regions of fewer tones with abrupt changes from one tone to another. 4. 5. (Canada, US, basketball, slang) To score a slam dunk in basketball against (one or more opposing players) by leaping over them; also (by extension, sports, slang), to score a goal, a point, etc., in some other sport against (one or more opposing players) in a spectacular manner. 6. (intransitive, graphic design, photography) To inadvertently or intentionally reduce the number of colours in a photograph or other image, changing a continuous gradation of tone to several regions of fewer tones with abrupt changes from one tone to another. <https://en.wiktionary.org/wiki/posterize> ___________________________ Wikiquote quote of the day: Instructions for living a life: Pay attention. Be astonished. Tell about it. --Mary Oliver <https://en.wikiquote.org/wiki/Mary_Oliver> _______________________________________________ Wikipedia Daily Article mailing list. To unsubscribe write to: [email protected] Questions or comments? Contact [email protected]
