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2. Treadmill - Wikipedia

   en.wikipedia.org/wiki/Treadmill

   With some weight relief, sprinters reach temporary speeds of up to 45 km/h (28 mph) and must therefore run on a large deck of up to 300 cm (120 in) in length and up to 100 cm (39 in) in width. With high physical exertion and an increased risk of falling, a fall-stop unit is required to prevent the subject or patient from falling.

3. United States customary units - Wikipedia

   en.wikipedia.org/wiki/United_States_customary_units

   For measuring length, the U.S. customary system uses the inch, foot, yard, and mile, which are the only four customary length measurements in everyday use. From 1893, the foot was legally defined as exactly 1200 ⁄ 3937 m (approximately 0.304 8006 m). [13] Since July 1, 1959, the units of length have been defined on the basis of 1 yd = 0.9144 ...

4. Treadmill desk - Wikipedia

   en.wikipedia.org/wiki/Treadmill_desk

   The recommended speed for walking on a treadmill while working at a computer is less than 2 miles per hour. To prevent injury, treadmill desks require compliance with the same ergonomic safety standards recommended for any computer desk, including placement such that the user's wrists are flat by the keyboard, their elbows form a 90-degree angle when typing, and their eyes may look forward to ...

5. Length measurement - Wikipedia

   en.wikipedia.org/wiki/Length_measurement

   Length measurement, distance measurement, or range measurement (ranging) all refer to the many ways in which length, distance, or range can be measured. The most commonly used approaches are the rulers, followed by transit-time methods and the interferometer methods based upon the speed of light .

6. Pace (unit) - Wikipedia

   en.wikipedia.org/wiki/Pace_(unit)

   A pace is a unit of length consisting either of one normal walking step (approximately 0.75 metres or 30 inches), or of a double step, returning to the same foot (approximately 1.5 metres or 60 inches). The normal pace length decreases with age and some health conditions. [1]

7. Standard (metrology) - Wikipedia

   en.wikipedia.org/wiki/Standard_(metrology)

   In metrology (the science of measurement), a standard (or etalon) is an object, system, or experiment that bears a defined relationship to a unit of measurement of a physical quantity. [1] Standards are the fundamental reference for a system of weights and measures , against which all other measuring devices are compared.

8. Rod (unit) - Wikipedia

   en.wikipedia.org/wiki/Rod_(unit)

   The rod is useful as a unit of length because integer multiples of it can form one acre of square measure (area). The 'perfect acre' [2] is a rectangular area of 43,560 square feet, bounded by sides 660 feet (a furlong) long and 66 feet (a chain) wide (220 yards by 22 yards) or, equivalently, 40 rods by 4 rods. An acre is therefore 160 square ...

9. Scale ruler - Wikipedia

   en.wikipedia.org/wiki/Scale_ruler

   An engineer's scale is a tool for measuring distances and transferring measurements at a fixed ratio of length. It is commonly made of plastic or aluminum and is just over 300 millimetres (12 in) long, but with the only 300 mm of markings, leaving the ends unmarked so that the first and last measuring ticks do not wear off.