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  2. Gas blending for scuba diving - Wikipedia

    en.wikipedia.org/wiki/Gas_blending_for_scuba_diving

    At this pressure and normal temperatures, air departs from linearity by about 5%, e.g. a 10-litre cylinder filled to 230 bar with air only contains about 95% of the expected 2300 litres of free air. Above this pressure, the composition of the final mix is difficult to predict using simple equations but needs the more complex Van der Waals ...

  3. Compressor - Wikipedia

    en.wikipedia.org/wiki/Compressor

    Natural gas compressor at a gas well High pressure reciprocating compressor from Belliss and Morcom, used in the bottling industry. A compressor is a mechanical device that increases the pressure of a gas by reducing its volume. An air compressor is a specific type of gas compressor.

  4. List of largest reptiles - Wikipedia

    en.wikipedia.org/wiki/List_of_largest_reptiles

    It is worth mentioning that unlike the upper weight of mammals, birds or fish, mass in reptiles is frequently poorly documented, thus subject to conjecture and estimation. [1] The saltwater crocodile is considered to be the largest extant reptile, verified at up to 6.32 m (20.7 ft) in length and around 1,000–1,500 kg (2,200–3,300 lb) in ...

  5. Self-contained breathing apparatus - Wikipedia

    en.wikipedia.org/wiki/Self-contained_breathing...

    Some types are also referred to as a compressed air breathing apparatus (CABA) or simply breathing apparatus (BA). Unofficial names include air pack, air tank, oxygen cylinder or simply pack, terms used mostly in firefighting. If designed for use under water, it is also known as a scuba set (self-contained underwater breathing apparatus).

  6. Aquatic animal - Wikipedia

    en.wikipedia.org/wiki/Aquatic_animal

    Aquatic animals generally conduct gas exchange in water by extracting dissolved oxygen via specialised respiratory organs called gills, through the skin or across enteral mucosae, although some are evolved from terrestrial ancestors that re-adapted to aquatic environments (e.g. marine reptiles and marine mammals), in which case they actually ...

  7. Marine reptile - Wikipedia

    en.wikipedia.org/wiki/Marine_reptile

    Marine reptiles are reptiles which have become secondarily adapted for an aquatic or semiaquatic life in a marine environment. Only about 100 of the 12,000 extant reptile species and subspecies are classed as marine reptiles, including marine iguanas , sea snakes , sea turtles and saltwater crocodiles .