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  2. List of rail transport modelling scale standards - Wikipedia

    en.wikipedia.org/wiki/List_of_rail_transport...

    The 37.5 mm length is not derived by a certain scale ratio. While HO scale is a 1:87 scale (3.5 mm to 1 foot), resulting in a 16.5 mm (0.65 in) gauge from real life prototype 1,435 mm (4 ft 8 + 1 ⁄ 2 in) standard gauge standard gauge. Conversely, modeling standard gauge in Lego trains would yield a scaling of (37.5:1435 =) 1:38.3.

  3. G scale - Wikipedia

    en.wikipedia.org/wiki/G_scale

    1:29 G scale boxcar by Aristo-Craft on G gauge track 1:32 scale 2-bay offset hopper by Mainline America. G scale or G gauge, also called large scale (45 mm or 1 + 3 ⁄ 4 inches), is a track gauge for model railways which is often used for outdoor garden railways because of its size and durability.

  4. HO scale - Wikipedia

    en.wikipedia.org/wiki/HO_scale

    HO or H0 is a rail transport modelling scale using a 1:87 scale (3.5 mm to 1 foot). It is the most popular scale of model railway in the world. [1] [2] The rails are spaced 16.5 millimetres (0.650 in) apart for modelling 1,435 mm (4 ft 8 + 1 ⁄ 2 in) standard gauge tracks and trains in HO.

  5. Orders of magnitude (power) - Wikipedia

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

    1 × 10 −20: −170 dBm tech: approximate power of Galileo space probe's radio signal (when at Jupiter) as received on earth by a 70-meter DSN antenna. 10 −18: atto-(aW) 1 × 10 −18: −150 dBm phys: approximate power scale at which operation of nanoelectromechanical systems are overwhelmed by thermal fluctuations. [4] 10 −16: 1 × 10 ...

  6. Normal distribution - Wikipedia

    en.wikipedia.org/wiki/Normal_distribution

    This fact is known as the 68–95–99.7 (empirical) rule, or the 3-sigma rule. More precisely, ... has a Lévy distribution with location 0 and scale ...

  7. Scale length (string instruments) - Wikipedia

    en.wikipedia.org/wiki/Scale_length_(string...

    For example, a 7/8 violin has a scale of about 317 mm, a 3/4-size instrument a scale of 307 mm, a half-size one 287 mm, and a quarter-size one 267 mm. 1/8, 1/10, 1/16 and 1/32 and even 1/64 violins also exist, becoming progressively smaller, but again in no proportional relationship. (A full-size instrument is described as 4/4.)

  8. O scale - Wikipedia

    en.wikipedia.org/wiki/O_scale

    O Scale in the UK is commonly 1:43.5 or 7 mm to the foot, in continental Europe it is commonly 1:45 or 1:43.5 is also used particularly in France, [3] and in the USA 1:48. [2] The NMRA and the MOROP maintain detailed standards for a variety of scales to help model makers create interoperable models.

  9. Rømer scale - Wikipedia

    en.wikipedia.org/wiki/Rømer_scale

    The Rømer scale (Danish pronunciation: [ˈʁœˀmɐ]; notated as °Rø), also known as Romer or Roemer, is a temperature scale named after the Danish astronomer Ole Christensen Rømer, who developed it for his own use in around 1702. It is based on the freezing point of pure water being 7.5 degrees and the boiling point of water as 60 degrees ...