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  2. Janka hardness test - Wikipedia

    en.wikipedia.org/wiki/Janka_hardness_test

    For hardwood flooring, the test usually requires an 80 mm × 150 mm (3 in × 6 in) sample with a thickness of at least 6–8 mm, and the most commonly used test is the ASTM D1037. When testing wood in lumber form, the Janka test is always carried out on wood from the tree trunk (known as the heartwood), and the standard sample (according to ...

  3. Specific surface area - Wikipedia

    en.wikipedia.org/wiki/Specific_surface_area

    Ceramic Raschig rings.....and plastic BiaƂecki rings of increased SSA. Values obtained for specific surface area depend on the method of measurement. In adsorption based methods, the size of the adsorbate molecule (the probe molecule), the exposed crystallographic planes at the surface and measurement temperature all affect the obtained specific surface area. [4]

  4. Floor plan - Wikipedia

    en.wikipedia.org/wiki/Floor_plan

    A floor plan is not a top view or bird's-eye view; it is a measured drawing to scale of the layout of a floor in a building. A top view or bird's-eye view does not show an orthogonally projected plane cut at the typical four foot height above the floor level. A floor plan may show any of the following elements: [3] interior walls and hallways ...

  5. American Measurement Standard - Wikipedia

    en.wikipedia.org/wiki/American_Measurement_Standard

    The methodology of the American Measurement Standard was compiled and edited by a consensus of real estate professionals including real estate agents, appraisers, assessors, home builders and architects, and is based on the exterior dimensions of a dwelling. The AMS contains over three times more specific home measurement details than any other ...

  6. M squared - Wikipedia

    en.wikipedia.org/wiki/M_squared

    When measuring the beam parameter product and M 2, one uses the D4σ or "second moment" width of the beam to determine both the radius of the beam's waist and the divergence in the far field. [ 1 ] M 2 can be measured by placing an array detector or scanning-slit profiler at multiple positions within the beam after focusing it with a lens of ...

  7. Floor area - Wikipedia

    en.wikipedia.org/wiki/Floor_area

    In architecture, construction, and real estate, floor area, floor space, or floorspace is the area (measured in square metres or square feet) taken up by a building or part of it. The ways of defining "floor area" depend on what factors of the building should or should not be included, such as external walls, internal walls, corridors, lift ...

  8. Area density - Wikipedia

    en.wikipedia.org/wiki/Area_density

    A special type of area density is called column density (also columnar mass density or simply column density), denoted ρ A or σ.It is the mass of substance per unit area integrated along a path; [1] It is obtained integrating volumetric density over a column: [2] =.

  9. Dimensional metrology - Wikipedia

    en.wikipedia.org/wiki/Dimensional_metrology

    Measurements are often expressed as a size relative to a theoretically perfect part that has its geometry defined in a print or computer model. A print is a blueprint illustrating the defined geometry of a part and its features. Each feature can have a size, a distance from other features, and an allowed tolerance set for each element.