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  2. Structural channel - Wikipedia

    en.wikipedia.org/wiki/Structural_channel

    Structural channel. The structural channel, also known as a C-channel or Parallel Flange Channel (PFC), is a type of (usually structural steel) beam, used primarily in building construction and civil engineering. Its cross section consists of a wide "web", usually but not always oriented vertically, and two "flanges" at the top and bottom of ...

  3. USB-C - Wikipedia

    en.wikipedia.org/wiki/USB-C

    All USB-C cables must be able to carry a minimum of 3 A current (at 5 V, for 15 W) but some can carry 5 A current (at 20 V, for 100 W). [12] USB-C to USB-C cables supporting 5 A current must contain e-marker chips (also marketed as E-Mark chips) programmed to identify the cable and its current capabilities. USB charging ports should be clearly ...

  4. Loading gauge - Wikipedia

    en.wikipedia.org/wiki/Loading_gauge

    As with AAR Plate C but 18 in (457 mm) taller than AAR Plate C and 15 in (381 mm) taller than AAR Plate E, and the car cross section is larger at the top than AAR Plate E. [31] H: 10 8 3.25 [34] 20 3 6.17: 62 7 19.08 [34] e.g. Including the height of double stacked containers in well cars. The cross section at the bottom of the well car differs ...

  5. Four-dimensional space - Wikipedia

    en.wikipedia.org/wiki/Four-dimensional_space

    Four-dimensional space ( 4D) is the mathematical extension of the concept of three-dimensional space (3D). Three-dimensional space is the simplest possible abstraction of the observation that one needs only three numbers, called dimensions, to describe the sizes or locations of objects in the everyday world.

  6. List of battery sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_battery_sizes

    3LR12 (4.5-volt), D, C, AA, AAA, AAAA (1.5-volt), A23 (12-volt), PP3 (9-volt), CR2032 (3-volt), and LR44 (1.5-volt) batteries. This is a list of the sizes, shapes, and general characteristics of some common primary and secondary battery types in household, automotive and light industrial use. The complete nomenclature for a battery specifies ...

  7. Moody chart - Wikipedia

    en.wikipedia.org/wiki/Moody_chart

    Moody chart. In engineering, the Moody chart or Moody diagram (also Stanton diagram) is a graph in non-dimensional form that relates the Darcy–Weisbach friction factor fD, Reynolds number Re, and surface roughness for fully developed flow in a circular pipe. It can be used to predict pressure drop or flow rate down such a pipe.

  8. I-beam - Wikipedia

    en.wikipedia.org/wiki/I-beam

    An I-beam used to support the first floor of a house. An I-beam is any of various structural members with an I - or H -shaped cross-section. Technical terms for similar items include H-beam, I-profile, universal column ( UC ), w-beam (for "wide flange"), universal beam ( UB ), rolled steel joist ( RSJ ), or double-T (especially in Polish ...

  9. CIELAB color space - Wikipedia

    en.wikipedia.org/wiki/CIELAB_color_space

    Each axis of each square ranges from −128 to 127. The CIELAB color space, also referred to as L*a*b*, is a color space defined by the International Commission on Illumination (abbreviated CIE) in 1976. [a] It expresses color as three values: L* for perceptual lightness and a* and b* for the four unique colors of human vision: red, green, blue ...