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  2. Orders of magnitude (length) - Wikipedia

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

    Leonardo da Vinci drew the Vitruvian Man within a square of side 1.83 m (6 ft 0 in) and a circle about 1.2 m (3 ft 11 in) in radius. To help compare different orders of magnitude, this section lists lengths between one meter and ten meters. Light, in vacuum, travels 1 meter in 1 ⁄ 299,792,458, or 3.3356409519815E-9 of a second.

  3. Subwoofer - Wikipedia

    en.wikipedia.org/wiki/Subwoofer

    The horn-loaded subwoofers each have a floor mouth that is 2.2 square meters (24 sq ft), and a horn length that is 9.5 meters (31 ft), in a cavity 1 meter (3 ft 3 in) under the floor of the listening room. Each subwoofer is driven by eight 18-inch subwoofer drivers with 100 millimeters (3.9 in) voice coils.

  4. Centimetre or millimetre of water - Wikipedia

    en.wikipedia.org/wiki/Centimetre_or_millimetre...

    A centimetre of water [1] is a unit of pressure. It may be defined as the pressure exerted by a column of water of 1 cm in height at 4 °C (temperature of maximum density) at the standard acceleration of gravity, so that 1 cmH 2 O (4°C) = 999.9720 kg/m 3 × 9.80665 m/s 2 × 1 cm = 98.063754138 Pa ≈ 98.0638 Pa, but conventionally a nominal maximum water density of 1000 kg/m 3 is used, giving ...

  5. Square inch - Wikipedia

    en.wikipedia.org/wiki/Square_inch

    1 square inch (assuming an international inch) is equal to: (the overbars indicate repeating decimals) 0.006 9 4 square feet (1 square foot is equal to 144 square inches) 0.000 7 71 604 9382 square yards (1 square yard is equal to 1,296 square inches) 6.4516 square centimetres (1 square centimetre is equal to 0.155 000 310... square inches)

  6. List of metric units - Wikipedia

    en.wikipedia.org/wiki/List_of_metric_units

    The outhouse is a unit of area used in nuclear physics equal to 10 −6 barns (100 am 2 = 10 −34 m 2). The barn (b) is a unit of area used in nuclear physics equal to one hundred femtometres squared (100 fm 2 = 10 −28 m 2). The are (a) is a unit of area equal to 100 m 2. The decare (daa) is a unit of area equal to 1000 m 2.

  7. Loudspeaker enclosure - Wikipedia

    en.wikipedia.org/wiki/Loudspeaker_enclosure

    Loudspeaker enclosures range in size from small "bookshelf" speaker cabinets with 4-inch (10 cm) woofers and small tweeters designed for listening to music with a hi-fi system in a private home to huge, heavy subwoofer enclosures with multiple 18-inch (46 cm) or even 21-inch (53 cm) speakers in huge enclosures which are designed for use in ...

  8. Inch - Wikipedia

    en.wikipedia.org/wiki/Inch

    Paragraph LXVII sets out the fine for wounds of various depths: one inch, one shilling; two inches, two shillings, etc. [m] An Anglo-Saxon unit of length was the barleycorn. After 1066, 1 inch was equal to 3 barleycorns, which continued to be its legal definition for several centuries, with the barleycorn being the base unit. [22]

  9. Column inch - Wikipedia

    en.wikipedia.org/wiki/Column_inch

    This can be confusing because it refers to two distinct measurements as if they were measured with the same unit. Normally one would think a 3 by 6 advertisement would be 3 inches wide by 6 inches high — but in reality it's actually about 5.5 inches wide by 6 inches high. In writing, an "×" is usually used to separate the two figures ...