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2. Help:Convert - Wikipedia

   en.wikipedia.org/wiki/Help:Convert

   By default, the output value is rounded to adjust its precision to match that of the input. An input such as 1234 is interpreted as 1234 ± 0.5, while 1200 is interpreted as 1200 ± 50, and the output value is displayed accordingly, taking into account the scale factor used in the conversion.

3. List of conversion factors - Wikipedia

   en.wikipedia.org/wiki/List_of_conversion_factors

   foot per hour: fph ≡ 1 ft/h = 8.4 6 × 10 −5 m/s foot per minute: fpm ≡ 1 ft/min = 5.08 × 10 −3 m/s: foot per second: fps ≡ 1 ft/s = 3.048 × 10 −1 m/s: furlong per fortnight: ≡ furlong/fortnight ≈ 1.663 095 × 10 −4 m/s: inch per hour: iph ≡ 1 in/h = 7.0 5 × 10 −6 m/s inch per minute: ipm ≡ 1 in/min = 4.2 3 × 10 −4 ...

4. Track gauge in the United States - Wikipedia

   en.wikipedia.org/wiki/Track_gauge_in_the_United...

   Some railways, primarily in the northeast, used standard gauge of 4 ft 8 + 1 ⁄ 2 in (1,435 mm); others used gauges ranging from 2 ft (610 mm) to 6 ft (1,829 mm). As a general rule, southern railroads were built to one or another broad gauge, mostly 5 ft ( 1,524 mm ), while northern railroads that were not standard-gauge tended to be narrow-gauge.

5. Standard-gauge railway - Wikipedia

   en.wikipedia.org/wiki/Standard-gauge_railway

   All other railways use 1,668 mm (5 ft 5 + 21 ⁄ 32 in) (broad gauge); some use 1,000 mm (3 ft 3 + 3 ⁄ 8 in) metre gauge; Decauville uses 500 mm (19 + 3 ⁄ 4 in) gauge. Planned and under construction high-speed railways to use 1,668 mm ( 5 ft 5 + 21 ⁄ 32 in ) to maintain interoperability with the rest of the network.

6. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

7. System of units of measurement - Wikipedia

   en.wikipedia.org/wiki/System_of_units_of_measurement

   The American football field, which has a playing area 100 yards (91.4 m) long by 160 feet (48.8 m) wide. This is often used by the American public media for the sizes of large buildings or parks. It is used both as a unit of length (100 yd or 91.4 m, the length of the playing field excluding goal areas) and as a unit of area (57,600 sq ft or ...