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  2. List of unusual units of measurement - Wikipedia

    en.wikipedia.org/wiki/List_of_unusual_units_of...

    In most US cities, a city block is between 1 ⁄ 16 and 1 ⁄ 8 mi (100 and 200 m). In Manhattan, the measurement "block" usually refers to a north–south block, which is 1 ⁄ 20 mi (80 m). Sometimes people living in places (like Manhattan) with a regularly spaced street grid will speak of long blocks and short blocks.

  3. List of named alloys - Wikipedia

    en.wikipedia.org/wiki/List_of_named_alloys

    AA-8000: used for electrical building wire in the U.S. per the National Electrical Code, replacing AA-1350. [1]Al–Li (2.45% lithium): aerospace applications, including the Space Shuttle

  4. R-value (insulation) - Wikipedia

    en.wikipedia.org/wiki/R-value_(insulation)

    If the interior of a home is at 20 °C and the roof cavity is at 10 °C then the temperature difference is 10 °C (or 10 K). Assuming a ceiling insulated to RSI 2.0 (R = 2 m 2 ⋅K/W), energy will be lost at a rate of 10 K / (2 K⋅m 2 /W) = 5 watts for every square meter (W/m 2) of ceiling. The RSI-value used here is for the actual insulating ...

  5. Orders of magnitude (area) - Wikipedia

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

    10 −6: 1 square millimetre (mm 2) 1–2 mm 2: Area of a human fovea [17] 2 mm 2: Area of the head of a pin: 10 −5 30–50 mm 2: Area of a 6–8 mm hole punched in a piece of paper by a hole punch [18] 10 −4: 1 square centimetre (cm 2) 290 mm 2: Area of one side of a U.S. penny [19] [20] 500 mm 2: Area of a typical postage stamp: 10 −3 ...

  6. 10 mm caliber - Wikipedia

    en.wikipedia.org/wiki/10_mm_caliber

    This is a list of firearm cartridges which have bullets in the 10 millimetres (0.39 in) to 10.99 millimetres (0.433 in) caliber range. Length refers to the cartridge case length. OAL refers to the overall length of the cartridge.

  7. Cobalt - Wikipedia

    en.wikipedia.org/wiki/Cobalt

    A block of electrolytically refined cobalt (99.9% purity) cut from a large plate. Cobalt is a ferromagnetic metal with a specific gravity of 8.9. The Curie temperature is 1,115 °C (2,039 °F) [12] and the magnetic moment is 1.6–1.7 Bohr magnetons per atom. [13] Cobalt has a relative permeability two-thirds that of iron. [14]

  8. Scale ruler - Wikipedia

    en.wikipedia.org/wiki/Scale_ruler

    One edge is divided into tenths of an inch, and the subsequent ones are directly marked for twentieths, thirtieths, fortieths, fiftieths, and finally sixtieths of an inch. Referred to as 1:10, 1:20, 1:30,1:40, 1:50 or 1:60 scale. [2] Typically in civil engineering applications, 1:10 (1″=10′) is used exclusively for detail drawings.

  9. Ø - Wikipedia

    en.wikipedia.org/wiki/Ø

    For example, a lens with a diameter of 82 millimeters would be engraved with " ⌀ 82 mm ". Ø or ⌀ is sometimes also used as a symbol for average value, particularly in German-speaking countries. ("Average" in German is Durchschnitt, directly translated as cut-through.) [6] Slashed zero is an alternate glyph for the zero character. Its slash ...