The metre (British spelling) or meter (American spelling; see spelling differences) (from the French unit mètre, from the Greek noun μέτρον, "measure"), symbol m, is the primary unit of length in the International System of Units (SI), though its prefixed forms are also used relatively frequently. The metre was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole along a great circle, so the Earth's circumference is approximately 40000 km. In 1799, the metre was redefined in terms of a prototype metre bar (the actual bar used was changed in 1889). In 1960, the metre was redefined in terms of a certain number of wavelengths of a certain emission line of krypton-86. The current definition was adopted in 1983 and modified slightly in 2002 to clarify that the metre is a measure of proper length. From 1983 until 2019, the metre was formally defined as the length of the path travelled by light in a vacuum in 1/299792458 of a second. After the 2019 redefinition of the SI base units, this definition was rephrased to include the definition of a second in terms of the caesium frequency ΔνCs; 299792458 m/s. (Wikipedia).
What is a metre: from Fizzics.org
The international base unit of length, accepted as the world wide standard, but where did it come from, who decided and how exactly is it defined.
From playlist Units of measurement
Examples: Converting Between Metric Units
This video provides several examples of converting between different metric units of measure.
From playlist Unit Conversions: Metric Units
Ex: Metric Conversions Using Unit Fractions - Length
This video provides three examples of how to perform metric conversions involving length using unit fractions. Site: http://mathispower4u.com Blog: http://mathispower4u.wordpress.com
From playlist Unit Conversions: Metric Units
This video explains how to convert to different metric units of measure for length, capacity, and mass. http://mathispower4u.wordpress.com/
From playlist Unit Conversions: Metric Units
Compare Metric Units using Metric Conversions (Unit Fractions)
This video explains how to compare quantities in metric units by perform conversions using unit fractions. http://mathispower4u.com
From playlist Unit Conversions: Metric Units
Physics CH 0.5: Standard Units (2 of 41) Length in MKS, Imperial, and Maritime
Visit http://ilectureonline.com for more math and science lectures! In this video I will state length in mks imperial, and maritime units. Next video in this series can be found at: https://youtu.be/flWOvyq6dMU
From playlist Michel van Biezen: Physics Mechanics 1: Introduction, Standard Units, and Vectors
Micrometer/diameter of daily used objects.
What was the diameter? music: https://www.bensound.com/
From playlist Fine Measurements
Parsecs, astronomical units and light years, distance units explained: fizzics.org
Notes to support this video lesson are here: https://www.fizzics.org/measuring-distance-in-astronomy/ Astronomical units , the parsec and the light year are different units commonly used to measure distances in astronomy. Where they come from and how they relate to our basic units of measu
From playlist Astronomy - physics of measuring distance
ʕ•ᴥ•ʔ Metric Units Conversion Basics: cm to m, m to km, and simplify
Quickly master how to convert from cm to mm, m to km, km to m, or cm to m with simple formulas. Watch more lessons like this and try our practice at https://www.studypug.com/algebra-1/measurement/metric-systems Metric system, as known as International System of Units, is an international
From playlist UK Year 9 Maths
The Drag Equation (Empire State Building v Eiffel Tower) - Numberphile
Tom Crawford discusses drag - then we drop the Empire State Building and Eiffel Tower into the ocean... Check out Brilliant (get 20% off their premium service): https://brilliant.org/numberphile (sponsor) More links & stuff in full description below ↓↓↓ Find out more about Tom Crawford:
From playlist Tom Crawford on Numberphile
The History of the Metric System - The Metre
In 1790, amidst the fires, violence, and decapitations of the French revolution, The Marquis of Condorcet and his four science bros revolutionize the world. Note: The "ligne" was one of the units of measure France used before the metre. Hi there! This is Barris, a French – American that
From playlist Liberté, Egalité, Fraternité!
ALL OF AQA PHYSICS (9-1) ⭐PAPER 2⭐ IN TWO HOURS!!!!! (2023) | GCSE PHYSICS | SCIENCE WITH HAZEL
Science with Hazel's Perfect Answer Revision Guides and workbooks for AQA GCSE Science are available at https://sciencewithhazel.co.uk Re-upload. Thought it made more sense to upload paper 1 and 2 separately. This covers all the material needed for grade 9, triple science. TOPIC TIMINGS
From playlist Complete AQA (9-1) GCSE Science Videos! //
SI UNITS Quick Fire Questions - GCSE Science Revision - SCIENCE WITH HAZEL
In this GCSE Physics revision video, Hazel asks you quick fire questions on all the SI units you will need to remember when answering questions in your physics GCSEs and IGCSEs. Remember that this video is aimed at all exam boards, so you will need a copy of your data sheet to know which
From playlist Quick Fire Questions //
Where Does River Water Go? - Numberphile
Tom Crawford on the mathematics of where river water goes when it hits the sea. See all three Navier-Stokes videos at: http://bit.ly/NavierPlaylist More links & stuff in full description below ↓↓↓ Tom Crawford works at the University of Oxford... more at: https://tomrocksmaths.com Playli
From playlist Tom Crawford on Numberphile
Wooden skyscrapers could be the future for cities
Wooden skyscrapers are an ambitious and innovative solution to the problems posed by urbanisation. Not only are they faster to build, they have smaller carbon footprints than high-rises made of concrete and steel. Click here to subscribe to The Economist on YouTube: http://econ.st/2GCbl
From playlist Timber Construction - The B1M
Designing the Perfect Airport Runway
Be one of the first 73 people to sign up with this link and get 20% off your subscription with Brilliant.org! https://brilliant.org/realengineering/ New vlog channel: https://www.youtube.com/channel/UCMet4qY3027v8KjpaDtDx-g Get your Real Engineering merch at: https://standard.tv/collect
From playlist Aviation
Speed of Light - Sixty Symbols
The little "c" representing the speed of light is perhaps the most famous symbol in physics and astronomy. More at http://www.sixtysymbols.com/ Featuring Mike Merrifield and Phil Moriarty.
From playlist Mike Merrifield - Sixty Symbols
Rise of the Supertelescopes Part 1 - Ground Telescopes
Astronomy is about to get much much more exciting, with a whole new class of enormous telescopes developed on Earth and in space. How much more powerful? What will we be able to see? Based on this web series from Evan Gough: https://www.universetoday.com/133648/rise-super-telescopes-giant
From playlist Water Vapor Exoplanet Playlist
Micrometer / diameter of daily used objects
What was the diameter? music: https://www.bensound.com/
From playlist Fine Measurements
Walking through the park. Kowloon Park is a large public park in Tsim Sha Tsui, Kowloon, Hong Kong. It has an area of 13.3 hectares (33 acres) and is managed by the Leisure and Cultural Services Department.[1] History The park was formerly the site of the Whitfield Barracks of the British
From playlist Attractions