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2. List of junior world records in swimming - Wikipedia

   en.wikipedia.org/wiki/List_of_junior_world...

   FINA World Junior Records in 25m pool are recognised starting on January 1, 2015. Records are recognized for long course (50 m pool) and short course (25 m pool) in the following events: relays: 4×50 free (short course only), 4×100 free, 4×200 free, 4×50 medley (short course only) and 4×100 medley. Also recognized are mixed relay records ...

3. Metre - Wikipedia

   en.wikipedia.org/wiki/Metre

   The metre (or meter in US spelling; symbol: m) is the base unit of length in the International System of Units (SI). Since 2019, the metre has been defined as the length of the path travelled by light in vacuum during a time interval of ⁠ 1 299 792 458⁠ of a second, where the second is defined by a hyperfine transition frequency of caesium.

4. World record progression 1500 metres freestyle - Wikipedia

   en.wikipedia.org/wiki/World_record_progression...

   The first world record in the men's 1500 metres freestyle in a long course (50 metres) swimming pool was recognised by the International Swimming Federation (FINA) in 1908. [ 1] In short course (25 metres) pools, the world's governing body recognizes world records since March 3, 1991.

5. World record progression 800 metres freestyle - Wikipedia

   en.wikipedia.org/wiki/World_record_progression...

   The first world record in the women's 800 metres freestyle in long course (50 metres) swimming was recognised by the International Swimming Federation (FINA) in 1931. The women's 880 yard freestyle had been a FINA-recognized world record event since 1919. However, in 1931 FINA decreed that only performances from 1931 onward would be eligible ...

6. History of the metre - Wikipedia

   en.wikipedia.org/wiki/History_of_the_metre

   History of the metre. An early definition of the metre was one ten-millionth of the Earth quadrant, the distance from the North Pole to the Equator, measured along a meridian through Paris. The history of the metre starts with the Scientific Revolution that is considered to have begun with Nicolaus Copernicus 's publication of De revolutionibus ...

7. List of United States high school national records in track ...

   en.wikipedia.org/wiki/List_of_United_States_high...

   The list of United States high-school national records in track and field is separated by indoor and outdoor and boys and girls who have set a national record in their respective events. While these records have been compiled for over 100 years, there are varying standards for these records. The National Federation of State High School ...

8. World record progression 50 metres freestyle - Wikipedia

   en.wikipedia.org/wiki/World_record_progression...

   The first world record in the men's 50 metres freestyle in long course (50 metres) swimming was recognized by the International Swimming Federation (FINA) in 1976. In short course (25 metres) swimming events the world's governing body recognizes world records since March 3, 1991. The drop in world record times in 2008-2009 coincided with the ...

9. Orders of magnitude (length) - Wikipedia

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

   The nanometre ( SI symbol: nm) is a unit of length in the metric system equal to 10−9 metres ( ⁠ 1 1 000 000 000⁠ m = 0.000 000 001 m ). To help compare different orders of magnitude, this section lists lengths between 10 −9 and 10 −8 m (1 nm and 10 nm). 1 nm – diameter of a carbon nanotube.