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  2. Brüel & Kjær - Wikipedia

    en.wikipedia.org/wiki/Brüel_&_Kjær

    Brüel & Kjær (Sound and Vibration Measurement A/S) is a Danish multinational engineering and electronics company headquartered in Nærum, near Copenhagen. It was the largest producer in the world of equipment for acoustic and vibrational measurements.

  3. Permeability (materials science) - Wikipedia

    en.wikipedia.org/wiki/Permeability_(Materials...

    The concept of permeability is of importance in determining the flow characteristics of hydrocarbons in oil and gas reservoirs, [4] and of groundwater in aquifers. [5]For a rock to be considered as an exploitable hydrocarbon reservoir without stimulation, its permeability must be greater than approximately 100 md (depending on the nature of the hydrocarbon – gas reservoirs with lower ...

  4. All waste is collected in tanks and emptied into toilet waste vehicles. [505] Blue ice is caused by accidental leakage from the waste tank. Passenger train toilets , on the other hand, have indeed historically flushed onto the tracks; modern trains in most developed countries usually have retention tanks on board and therefore do not dispose of ...

  5. Medium Mark B - Wikipedia

    en.wikipedia.org/wiki/Medium_Mark_B

    Two fuel tanks at the back held 85 imperial gallons (386 L) of petrol. Other innovations were the ability to lay a smoke screen and the use of sloped armour in the front of the hull. The smoke screen device consisted of a sulphonic acid reservoir located over the exhaust pipe. [ 2 ]

  6. Nitrox - Wikipedia

    en.wikipedia.org/wiki/Nitrox

    Meanwhile, diving stores were finding a purely economic reason to offer nitrox: not only was an entire new course and certification needed to use it, but instead of cheap or free tank fills with compressed air, dive shops found they could charge premium amounts of money for custom-gas blending of nitrox to their ordinary, moderately experienced ...

  7. Gas - Wikipedia

    en.wikipedia.org/wiki/Gas

    Drifting smoke particles indicate the movement of the surrounding gas.. Gas is one of the four fundamental states of matter.The others are solid, liquid, and plasma. [1] A pure gas may be made up of individual atoms (e.g. a noble gas like neon), elemental molecules made from one type of atom (e.g. oxygen), or compound molecules made from a variety of atoms (e.g. carbon dioxide).

  8. Surface roughness - Wikipedia

    en.wikipedia.org/wiki/Surface_roughness

    Areal roughness parameters are defined in the ISO 25178 series. The resulting values are Sa, Sq, Sz,... Many optical measurement instruments are able to measure the surface roughness over an area. Area measurements are also possible with contact measurement systems. Multiple, closely spaced 2D scans are taken of the target area.

  9. Glossary of underwater diving terminology: A–C - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_underwater...

    B.K. hook BK safety hook A type of safety lifting hook which is held closed when under load by a lever system where the weight of the load holds the bill of the hook against the safety latch. [44] black-water diving. see also: blue-water diving. Diving in mid-water at night where the bottom is out of diving range. blending stick

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