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  2. Column inch - Wikipedia

    en.wikipedia.org/wiki/Column_inch

    The column inch size for advertisements that spread over more than one column is determined by multiplying the number of inches high by number of columns. For example, an advertisement that is 3 columns wide by 6 inches high takes up 18 column inches (3 columns wide multiplied by 6 inches high). To determine the cost of the advertisement ...

  3. Inch of water - Wikipedia

    en.wikipedia.org/wiki/Inch_of_water

    Inch of water. Inches of water is a non- SI unit for pressure. It is also given as inches of water gauge ( iwg or in.w.g. ), inches water column ( inch wc, in. WC, " wc, etc. or just wc or WC ), inAq, Aq, or inH2O. The units are conventionally used for measurement of certain pressure differentials such as small pressure differences across an ...

  4. Pressure head - Wikipedia

    en.wikipedia.org/wiki/Pressure_head

    So, for any particular measurement of pressure head, the height of a column of water will be about [133/9.8 = 13.6] 13.6 times taller than a column of mercury would be. So if a water column meter reads "13.6 cm H 2 O ", then an equivalent measurement is "1.00 cm Hg".

  5. Sieve analysis - Wikipedia

    en.wikipedia.org/wiki/Sieve_analysis

    A sieve analysis (or gradation test) is a practice or procedure used in geology, civil engineering, [1] and chemical engineering [2] to assess the particle size distribution (also called gradation) of a granular material by allowing the material to pass through a series of sieves of progressively smaller mesh size and weighing the amount of material that is stopped by each sieve as a fraction ...

  6. Pixel density - Wikipedia

    en.wikipedia.org/wiki/Pixel_density

    Scanners and cameras. "PPI" or "pixel density" may also describe image scanner resolution. In this context, PPI is synonymous with samples per inch. In digital photography, pixel density is the number of pixels divided by the area of the sensor. A typical DSLR, circa 2013, has 1–6.2 MP/cm 2; a typical compact has 20–70 MP/cm 2 .

  7. I-beam - Wikipedia

    en.wikipedia.org/wiki/I-beam

    In Australia, these steel sections are commonly referred to as Universal Beams (UB) or Columns (UC). The designation for each is given as the approximate height of the beam, the type (beam or column) and then the unit metre rate (e.g., a 460UB67.1 is an approximately 460 mm (18.1 in) deep universal beam that weighs 67.1 kg/m (135 lb/yd)). [6]

  8. Area density - Wikipedia

    en.wikipedia.org/wiki/Area_density

    Area density. The area density (also known as areal density, surface density, superficial density, areic density, mass thickness, column density, or density thickness) of a two-dimensional object is calculated as the mass per unit area. The SI derived unit is the kilogram per square metre (kg·m −2 ). A related area number density can be ...

  9. AOL Mail

    mail.aol.com

    You can find instant answers on our AOL Mail help page. Should you need additional assistance we have experts available around the clock at 800-730-2563.