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1. Hydrogen cycle: The hydrogen cycle consists of hydrogen exchanges between biotic (living) and abiotic (non-living) sources and sinks of hydrogen-containing compounds. Hydrogen (H) is the most abundant element in the universe. (Hydrogen exchange between the living and non-living world) [100%] 2022-09-08 [Biogeochemical cycle] [Metabolism]...
2. Hydrogen cycle: For the nuclear fusion process producing helium from hydrogen see Proton-proton chain reaction Template:Expert Hydrogen is one of the constituents of water. It recycles as in other biogeochemical cycles. [100%] 2023-04-20 [Ecological cycles] [Metabolism]...
3. Hydrogen: Hydrogen (H) is an element comprising 1 proton and 1 electron. It is the only chemical element that normally doesn't have any neutrons in its atoms. [76%] 2023-02-19 [Elements]
4. Hydrogen: o = 16)], one of the chemical elements., water, and γεννάειν, to produce, in allusion to the fact that water is produced when the gas burns in air. Hydrogen appears to have been recognized by Paracelsus in the 16th century; the combustibility ... [76%] 2022-09-02
5. Hydrogen: Hydrogen is the chemical element with the symbol H and atomic number 1. Hydrogen is the lightest element. [76%] 2022-07-28 [Hydrogen] [Chemical elements]...
6. Hydrogen: Hydrogen is the most abundant of all the elements, and has the chemical symbol H and an atomic number of 1. Despite this abundance, naturally occurring elemental hydrogen is extremely rare on Earth. [76%] 2023-02-26
7. Hydrogen: Hydrogen (chemical symbol H, atomic number 1) is the lightest chemical element and the most abundant of all elements, constituting roughly 75 percent of the elemental mass of the universe. Stars in the main sequence are mainly composed of hydrogen ... [76%] 2023-02-03
8. Hydrogen: Editor-In-Chief: C. Michael Gibson, M.S., M.D. [76%] 2023-05-31 [Hydrogen] [Chemical elements]...
9. Hydrogen: Hydrogen is a chemical element, typically found as a gas in its elemental form. It has the chemical symbol H, atomic number (number of protons) Z = 1, and a standard atomic weight of 1.00794 g•mol. [76%] 2022-09-06
10. Hydrogen: Hydrogen is the chemical element with the symbol H and atomic number 1. Hydrogen is the lightest element. (Chemistry) [76%] 2021-12-22 [Hydrogen] [Chemical elements]...
11. Hot-bulb engine: The hot-bulb engine is a type of internal combustion engine in which fuel ignites by coming in contact with a red-hot metal surface inside a bulb, followed by the introduction of air (oxygen) compressed into the hot-bulb ... (Internal combustion engine) [71%] 2022-06-06 [English inventions] [Marine engines]...
12. Hot air engine: A hot air engine (historically called an air engine or caloric engine) is any heat engine that uses the expansion and contraction of air under the influence of a temperature change to convert thermal energy into mechanical work. These engines ... (Engineering) [71%] 2022-08-08 [Engines]
13. Hot tube engine: The hot tube engine is a primitive and long-obsolete type of combustion engine, not to be confused with the hot-bulb engine. The timing of a hot tube engine is controlled by means of varying the length of the ... (Engineering) [71%] 2022-12-23 [Engine technology]
14. Solar–hydrogen energy cycle: Solar–hydrogen energy cycle is an energy cycle where a solar powered electrolyzer is used to convert water to hydrogen and oxygen. Hydrogen and oxygen produced thus are stored to be used by a fuel cell to produce electricity when ... (Physics) [70%] 2023-11-20 [Thermodynamic cycles] [Hydrogen production]...
15. Solar–hydrogen energy cycle: Solar–hydrogen energy cycle is an energy cycle where a solar powered electrolyzer is used to convert water to hydrogen and oxygen. Hydrogen and oxygen produced thus are stored to be used by a fuel cell to produce electricity when ... [70%] 2023-09-24 [Thermodynamic cycles] [Hydrogen production]...
16. Variable cycle engine: A variable cycle engine (VCE), also referred to as adaptive cycle engine (ACE), is an aircraft jet engine that is designed to operate efficiently under mixed flight conditions, such as subsonic, transonic and supersonic. The next generation of supersonic transport ... (Physics) [69%] 2024-01-11 [Mechanics] [Jet engines]...
17. Variable cycle engine: A variable cycle engine (VCE), also referred to as adaptive cycle engine (ACE), is an aircraft jet engine that is designed to operate efficiently under mixed flight conditions, such as subsonic, transonic and supersonic. The next generation of supersonic transport ... (Aircraft propulsion system efficient at a range of speeds higher and lower than sound's) [69%] 2024-01-10 [Mechanics] [Jet engines]...
18. Hot (Freda Payne album): Hot was Freda Payne's ninth studio album and her third and final for Capitol Records. Although she did record a few singles during the 1980s (including three for Ian Levine's UK Motorcity label), it would be 16 years ... (Freda Payne album) [68%] 2023-12-03 [1979 albums] [Freda Payne albums]...
19. Hot (Mel B album): Hot is the debut album by the English singer Mel B, released on 9 October 2000 by Virgin. It was not as successful as her albums with the Spice Girls or that of other members' solo albums released around this ... (Mel B album) [68%] 2023-11-17 [2000 debut albums] [Albums produced by Jimmy Jam and Terry Lewis]...
20. Hot (песня Аврил Лавин): «Hot» — третий сингл с третьего альбома Аврил Лавин — The Best Damn Thing — продюсером которого выступил Dr. Luke. (Песня Аврил Лавин) [68%] 2023-11-09