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  2. Air lock - Wikipedia

    en.wikipedia.org/wiki/Air_lock

    'S' trap inlet to drain [further explanation needed]. The air lock phenomenon can be used in a number of useful ways. An 'S' trap (a pipe that descends from a reservoir, then curves back up, then down again) allows liquid to flow from top to bottom unhindered, and gas cannot flow through the trap unless it has enough extra pressure to overcome the liquid head of the trap.

  3. Sewer gas - Wikipedia

    en.wikipedia.org/wiki/Sewer_gas

    An old sewer gas chimney in Stonehouse, Plymouth, England, built in the 1880s to disperse sewer gas above residents. Sewer gas is a complex, generally obnoxious smelling mixture of toxic and nontoxic gases produced and collected in sewage systems by the decomposition of organic household or industrial wastes, typical components of sewage.

  4. Trap (plumbing) - Wikipedia

    en.wikipedia.org/wiki/Trap_(plumbing)

    Maintaining the water seal is critical to trap operation; traps might dry out, and poor venting can suction or blow water out of the traps. This is usually avoided by venting the drain pipes downstream of the trap; by being vented to the atmosphere outside the building, the drain lines never operate at a pressure much higher or lower than ...

  5. Drainage - Wikipedia

    en.wikipedia.org/wiki/Drainage

    Drainage is the natural or artificial removal of a surface's water and sub-surface water from an area with excess water. The internal drainage of most agricultural soils can prevent severe waterlogging (anaerobic conditions that harm root growth), but many soils need artificial drainage to improve production or to manage water supplies.

  6. Plumbing - Wikipedia

    en.wikipedia.org/wiki/Plumbing

    Old water pipe, remnant of the Machine de Marly near Versailles, France. Lead was the favoured material for water pipes for many centuries because its malleability made it practical to work into the desired shape. Such use was so common that the word "plumbing" derives from plumbum, the Latin word for lead.

  7. Amine gas treating - Wikipedia

    en.wikipedia.org/wiki/Amine_gas_treating

    Amine gas plant at a natural gas field. Amine gas treating, also known as amine scrubbing, gas sweetening and acid gas removal, refers to a group of processes that use aqueous solutions of various alkylamines (commonly referred to simply as amines) to remove hydrogen sulfide (H 2 S) and carbon dioxide (CO 2) from gases.

  8. Penile discharge - Wikipedia

    en.wikipedia.org/wiki/Penile_discharge

    Penile discharge is fluid that comes from the urethra at the end of the penis that is not urine, pre-ejaculate or semen. [2] [3] Common causes include infections due to gonorrhea, chlamydia, or trichomoniasis. [3] In gonorrhea the discharge may be white, yellow, or green. [4] [5] A swab of the discharge is usually performed. [5] Treatment ...

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