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  2. Grain size - Wikipedia

    en.wikipedia.org/wiki/Grain_size

    0.5–1 mm 0.020–0.039 in Coarse sand 2 to 1 0.25–0.5 mm 0.010–0.020 in Medium sand 3 to 2 125–250 μm: 0.0049–0.010 in Fine sand 4 to 3 62.5–125 μm

  3. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    5.2 mheight of a giraffe [123] 5.5 mheight of a Baluchitherium, the largest land mammal ever lived; 6.5 m – wingspan of Argentavis, the largest flying bird known; 6.7 mlength of a Microchaetus rappi; 7.4 m – wingspan of Pelagornis, the bird with longest wingspan ever. [124] 7.5 m – approximate length of the human ...

  4. List of electronic component packaging types - Wikipedia

    en.wikipedia.org/wiki/List_of_chip_carriers

    Problematically, some manufacturers are developing metric 0201 components with dimensions of 0.25 mm × 0.125 mm (0.0098 in × 0.0049 in), [31] but the imperial 01005 name is already being used for the 0.4 mm × 0.2 mm (0.0157 in × 0.0079 in) package. These increasingly small sizes, especially 0201 and 01005, can sometimes be a challenge from ...

  5. Roughness length - Wikipedia

    en.wikipedia.org/wiki/Roughness_length

    As an approximation, the roughness length is approximately one-tenth of the height of the surface roughness elements. For example, short grass of height 0.01 meters has a roughness length of approximately 0.001 meters. Surfaces are rougher if they have more protrusions. Forests have much larger roughness lengths than tundra, for example.

  6. ISO metric screw thread - Wikipedia

    en.wikipedia.org/wiki/ISO_metric_screw_thread

    The length of a machine screw or bolt is indicated by an × and the length expressed in millimetres (e.g. M8-1.25×30 or M8×30). [citation needed] Tolerance classes defined in ISO 965-1 can be appended to these designations, if required (e.g. M500– 6g in external threads). External threads are designated by lowercase letter, g or h.

  7. List of tablet PC dimensions and case sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_tablet_PC...

    Tablet cases sizes Tablet PC Height Width Depth Screen Case size Acer Iconia Tab A500 [1]: 10.2 in (260 mm) 7 in (180 mm) 0.52 in (13 mm) 10.1 in (260 mm)

  8. Parts-per notation - Wikipedia

    en.wikipedia.org/wiki/Parts-per_notation

    In fractions like "2 nanometers per meter" (2 n m / m = 2 nano = 2×10 −9 = 2 ppb = 2 × 0.000 000 001), so the quotients are pure-number coefficients with positive values less than or equal to 1. When parts-per notations, including the percent symbol (%), are used in regular prose (as opposed to mathematical expressions), they are still pure ...

  9. Hydraulic jumps in rectangular channels - Wikipedia

    en.wikipedia.org/wiki/Hydraulic_Jumps_in...

    The height of the hydraulic jump, similar to length, is useful to know when designing waterway structures like settling basins or spillways. The height of the hydraulic jump is simply the difference in flow depths prior to and after the hydraulic jump. The height can be determined using the Froude number and upstream energy. Equations: