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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. 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 ...

5. 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 ...

6. World record progression 200 metres freestyle - Wikipedia

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

   This is a history of the progression of the world record for the 200 metres freestyle swimming event. It is a listing of the fastest-times-ever swum in the event, in both long course (50m) and short course (25m) swimming pools. These records are maintained and recognized by FINA, which oversees international competitive swimming and Aquatics.

7. 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 ...

8. List of highly toxic gases - Wikipedia

   en.wikipedia.org/wiki/List_of_highly_toxic_gases

   Toxic: a chemical that has a median lethal concentration (LC 50) in air of more than 200 parts per million (ppm) but not more than 2,000 parts per million by volume of gas or vapor, or more than 2 milligrams per liter but not more than 20 milligrams per liter of mist, fume or dust, when administered by continuous inhalation for 1 hour (or less if death occurs within 1 hour) to albino rats ...

9. Multimeter - Wikipedia

   en.wikipedia.org/wiki/Multimeter

   A multimeter (also known as a volt-ohm-milliammeter, volt-ohmmeter or VOM) [ 1] is a measuring instrument that can measure multiple electrical properties. [ 2][ 3] A typical multimeter can measure voltage, resistance, and current, [ 4] in which case can be used as a voltmeter, ohmmeter, and ammeter. Some feature the measurement of additional ...