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  2. 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 ...

  3. Hegman gauge - Wikipedia

    en.wikipedia.org/wiki/Hegman_gauge

    A Hegman gauge, sometimes referred to as a grind gauge, grind gage, or grindometer, is an instrument which indicates the fineness of grind or the presence of coarse particles and agglomeration in a dispersion. [1]

  4. Gauge (firearms) - Wikipedia

    en.wikipedia.org/wiki/Gauge_(firearms)

    The least popular sizes are the 10 gauge and the 16 gauge; while far less common than the other four gauges, they are still commercially available. [citation needed] [9] Shotguns and shells exceeding 10 gauge, such as the 8 gauge, 6 gauge, 4 gauge, and 2 gauge are historically important in the United Kingdom and elsewhere in mainland Europe ...

  5. Picometre - Wikipedia

    en.wikipedia.org/wiki/Picometre

    The picometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: pm) or picometer (American spelling) is a unit of length in the International System of Units (SI), equal to 1 × 10 −12 m, or one trillionth (⁠ 1 / 1 000 000 000 000 ⁠) of a metre, which is the SI base unit of length.

  6. Mesh (scale) - Wikipedia

    en.wikipedia.org/wiki/Mesh_(scale)

    Although such information contains long lists of sieve sizes, in practice sieves are normally used in series in which each member sieve is selected to pass particles approximately 1/ √ 2 smaller in diameter or 1/2 smaller in cross-sectional area than the previous sieve. For example the series 80mm, 63, 40, 31.5, 20, 16, 14, 10, 8, 6.3, 4, 2.8 ...

  7. Music fests and tours and concerts in 2025: What's lined up - AOL

    www.aol.com/music-fests-tours-concerts-2025...

    After more than ten years, the iconic Britpop band is reuniting for live shows in the U.S. They will perform at Soldier Field in Chicago Aug. 28 and then at the MetLife Stadium in East Rutherford ...

  8. List of battery sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_battery_sizes

    There were two ⌀3.2 mm negative pins spaced 9.5 mm apart and two ⌀4.0 mm positive pins spaced 14.3 mm apart. Negative and positive pins were spaced 18.1 mm apart. It was used in some early transistor radio amplifiers with a Class B output stage, allowing the loud speaker to be connected between the amplifier output and the battery center tap.

  9. Holiday sleep trouble? 5 secrets of a better snooze

    www.aol.com/holiday-sleep-trouble-5-secrets...

    Getting a good night's sleep can be a little more challenging amid the hype of the holidays. With changes in routine, diet and potentially time zones, quality sleep could be difficult to come by ...