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  2. Orders of magnitude (length) - Wikipedia

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

    The millimetre (SI symbol: mm) is a unit of length in the metric system equal to 10 −3 metres (⁠ 1 / 1 000 ⁠ m = 0.001 m). To help compare different orders of magnitude, this section lists lengths between 10 −3 m and 10 −2 m (1 mm and 1 cm). 1.0 mm – 1/1,000 of a meter; 1.0 mm – 0.03937 inches or 5/127 (exactly)

  3. Men's 400 metres world record progression - Wikipedia

    en.wikipedia.org/wiki/Men's_400_metres_world...

    The first world record in the 400 m for men was recognized by the International Amateur Athletics Federation, now known as World Athletics, in 1912.The IAAF ratified Charles Reidpath's 48.2 s performance set at that year's Stockholm Olympics as a world record, but it also recognized the superior mark over 440 yards (402.336 metres) run by Maxie Long in 1900 as a world record.

  4. List of world records in masters athletics - Wikipedia

    en.wikipedia.org/wiki/List_of_world_records_in...

    Masters athletics is a class of the sport of athletics for athletes of over 35 years of age. The events include track and field, road running and cross country running.These are the current world records in various five-year-groups, maintained by WMA, the World Association of Masters Athletes, which is designated by the World Athletics (formerly IAAF) to conduct the worldwide sport of Masters ...

  5. 400 metres - Wikipedia

    en.wikipedia.org/wiki/400_metres

    The 400 metres, or 400-meter dash, is a sprint event in track and field competitions. It has been featured in the athletics programme at the Summer Olympics since 1896 for men and since 1964 for women. On a standard outdoor running track, it is one lap around the track. Runners start in staggered positions and race in separate lanes for the ...

  6. 400 metres at the Olympics - Wikipedia

    en.wikipedia.org/wiki/400_metres_at_the_Olympics

    The 400 metres at the Summer Olympics has been contested since the first edition of the multi-sport event. The men's 400 m has been present on the Olympic athletics programme since 1896 but nearly seventy years passed before the introduction of the women's 400 m, which has been held continuously since the 1964 Games. It is the most prestigious ...

  7. Women's 400 metres hurdles world record progression

    en.wikipedia.org/wiki/Women's_400_metres_hurdles...

    The women's 400 metres hurdles is an outdoor track event over a distance of 400 metres with ten hurdles at the height of 76.2 cm (30 inches). [1] The world records of this women's event have been recognised by World Athletics (called the International Association of Athletics Federations until 2019) since 1974. [2]

  8. Millimetre - Wikipedia

    en.wikipedia.org/wiki/Millimetre

    Different lengths as in respect to the electromagnetic spectrum, measured by the metre and its derived scales.The microwave is between 1 meter to 1 millimeter.. The millimetre (international spelling; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, which is the SI base unit of length.

  9. 400 meters at the NCAA Division I Indoor Track and Field ...

    en.wikipedia.org/wiki/400_meters_at_the_NCAA...

    This is a list of the NCAA Division I indoor champions in the 400 metres or its imperial equivalent 440 yards. The imperial distance was generally contested until 1983, while the metric distance has been held instead since 1984. The event was not held in 1986 and 1987.