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2. Aerial refueling - Wikipedia

   en.wikipedia.org/wiki/Aerial_refueling

   A KC-135 Stratotanker refuels an F-16 Fighting Falcon using a flying boom. Aerial refueling (), or aerial refuelling (), also referred to as air refueling, in-flight refueling (IFR), air-to-air refueling (AAR), and tanking, is the process of transferring aviation fuel from one aircraft (the tanker) to another (the receiver) while both aircraft are in flight.

3. Pipe (fluid conveyance) - Wikipedia

   en.wikipedia.org/wiki/Pipe_(fluid_conveyance)

   The ends of pipe to be welded must have a certain weld preparation called an End Weld Prep (EWP) which is typically at an angle of 37.5 degrees to accommodate the filler weld metal. The most common pipe thread in North America is the National Pipe Thread (NPT) or the Dryseal (NPTF) version.

4. Carbon black - Wikipedia

   en.wikipedia.org/wiki/Carbon_black

   Worker at carbon black plant, 1942. Carbon black (with subtypes acetylene black, channel black, furnace black, lamp black and thermal black) is a material produced by the incomplete combustion of coal tar, vegetable matter, or petroleum products, including fuel oil, fluid catalytic cracking tar, and ethylene cracking in a limited supply of air.

5. AOL.com - News, Sports, Weather, Entertainment, Local & Lifestyle

   www.aol.com

   AOL latest headlines, entertainment, sports, articles for business, health and world news.

6. Screw thread - Wikipedia

   en.wikipedia.org/wiki/Screw_thread

   For example, tables of caliper measurements show 0.69 female ID and 0.75 male OD for the standards of "3/4 SAE J512" threads and "3/4-14 UNF JIS SAE-J514 ISO 8434-2". [6] Note the female threads are identified by the corresponding male major diameter (3/4 inch), not by the actual measurement of the female threads.

7. Air–fuel ratio - Wikipedia

   en.wikipedia.org/wiki/Air–fuel_ratio

   Air–fuel ratio (AFR) is the mass ratio of air to a solid, liquid, or gaseous fuel present in a combustion process. The combustion may take place in a controlled manner such as in an internal combustion engine or industrial furnace, or may result in an explosion (e.g., a dust explosion).