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2. Low-flow fixtures - Wikipedia

   en.wikipedia.org/wiki/Low-flow_fixtures

   Kitchen and bathroom faucets were limited to a flow rate of 2.2 gpm (gallons per minute) at 60 psi, and residential shower heads were limited to a flowrate of 2.5 gpm at 80 psi. [ 3 ] In response to an increasing number of water shortages and increased water utility rates there has been recent legislation by many states leading the way in water ...

3. List of vacuum tubes - Wikipedia

   en.wikipedia.org/wiki/List_of_vacuum_tubes

   The "CV4000" numbers identify special-quality valves though SQ valves CV numbered before that rule came in retain their original CV number: CV4007 = E91AA – SQ version of 6AL5 CV4010 = E95F – SQ version of 6AK5 or EF95

4. List of DIN standards - Wikipedia

   en.wikipedia.org/wiki/List_of_DIN_standards

   Cross recessed countersunk head tapping screws: Withdrawn: DIN ISO 7050: ISO 7050: DIN 7983: Countersunk (Flat) Head Tapping Screws with Cross Recess: Withdrawn: DIN ISO 7051: ISO 7051: DIN 7984: Hexagon socket head cap screws with low head: Active: DIN 7985: Cross recessed raised Phillips Pan head screws: Withdrawn: DIN EN ISO 7045: ISO 7045 ...

5. Multi-valve - Wikipedia

   en.wikipedia.org/wiki/Multi-valve

   The Ducati ST3 V-twin had 3-valve heads. Four-valve cylinder head; This is the most common type of multi-valve head, with two exhaust valves and two similar (or slightly larger) inlet valves. This design allows similar breathing as compared to a three-valve head, and as the small exhaust valves allow high RPM, this design is very suitable for ...

6. Chézy formula - Wikipedia

   en.wikipedia.org/wiki/Chézy_formula

   The Chézy Formula is a semi-empirical resistance equation [1] [2] which estimates mean flow velocity in open channel conduits. [3] The relationship was conceptualized and developed in 1768 by French physicist and engineer Antoine de Chézy (1718–1798) while designing Paris's water canal system.

7. Mach number - Wikipedia

   en.wikipedia.org/wiki/Mach_number

   The Mach number (M or Ma), often only Mach, (/ m ɑː k /; German:) is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound.