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  2. Gas blending for scuba diving - Wikipedia

    en.wikipedia.org/wiki/Gas_blending_for_scuba_diving

    In the case of the Tx 20/40, in a 230 bar cylinder, this would be 230 bar x 40% = 92 bar (or for a 3,000 psi fill, it would require 3,000 x 40% = 1,200 psi of helium). The amount of oxygen is more difficult to calculate, as it is derived from two sources, the added oxygen and the air top-up.

  3. Scuba gas management - Wikipedia

    en.wikipedia.org/wiki/Scuba_gas_management

    Rebreather diver with bailout and decompression cylinders. Scuba gas management is the aspect of scuba diving which includes the gas planning, blending, filling, analysing, marking, storage, and transportation of gas cylinders for a dive, the monitoring and switching of breathing gases during a dive, efficient and correct use of the gas, and the provision of emergency gas to another member of ...

  4. Hydrox (breathing gas) - Wikipedia

    en.wikipedia.org/wiki/Hydrox_(breathing_gas)

    Hydrox, a gas mixture of hydrogen and oxygen, is occasionally used as an experimental breathing gas in very deep diving. [ 1 ] [ 2 ] It allows divers to descend several hundred metres. [ 3 ] [ 4 ] [ 5 ] Hydrox has been used experimentally in surface supplied, saturation, and scuba diving, both on open circuit and with closed circuit rebreathers.

  5. Hofmann voltameter - Wikipedia

    en.wikipedia.org/wiki/Hofmann_voltameter

    The amount of electricity that has passed through the system can then be determined from the volume of gas. Thomas Edison used voltameters as electricity meters.. A Hofmann voltameter is often used as a demonstration of stoichiometric principles, as the two-to-one ratio of the volumes of hydrogen and oxygen gas produced by the apparatus illustrates the chemical formula of water, H 2 O.

  6. Cascade filling system - Wikipedia

    en.wikipedia.org/wiki/Cascade_filling_system

    P 2 and V 2 the initial pressure and volume of the other cylinder and P 3 is the equilibrium pressure. An example could be a 100-litre (internal volume) cylinder (V 1) pressurised to 200 bar (P 1) filling a 10-litre (internal volume) cylinder (V 2) which was unpressurised (P 2 = 1 bar) (resulting in both cylinder equalising to approximately 180 ...

  7. Chemical oxygen generator - Wikipedia

    en.wikipedia.org/wiki/Chemical_oxygen_generator

    A chlorate candle, or an oxygen candle, is a cylindrical chemical oxygen generator that contains a mix of sodium chlorate and iron powder, which when ignited smolders at about 600 °C (1,100 °F), producing sodium chloride, iron oxide, and oxygen at a fixed rate of about 6.5 man-hours per kilogram of the mixture. The mixture has an indefinite ...

  8. World's first hydrogen-powered commercial ferry set to ... - AOL

    www.aol.com/news/worlds-first-hydrogen-powered...

    The world’s first hydrogen-powered commercial passenger ferry will start operating on San Francisco Bay as part of plans to phase out diesel-powered vessels and reduce planet-warming carbon ...

  9. Oxychlorination - Wikipedia

    en.wikipedia.org/wiki/Oxychlorination

    Iron(III) chloride is produced commercially by oxychlorination (and other methods). For example, dissolution of iron ores in hydrochloric acid gives a mixture of ferrous and ferric chlorides: [4] Fe 3 O 4 + 8 HCl → FeCl 2 + 2 FeCl 3 + 4 H 2 O. The iron(II) chloride is converted to the iron(III) derivative by treatment with oxygen and ...