Of Metres, Years and Light Years
Everyone knows that a metre is indeed just that, a metre. That's not the full story, there is more to the metre than meets the eye!
The metre was defined in 1793 for the first time, when the French government decreed it to be one ten-millionth of the length of the Earth's quadrant passing through Paris. After this arc was surveyed (incorrectly), three platinum standards were made along with several iron copies.
When the Systeme Internationale (SI) of units was set up in 1875, the metre was defined to be the distance between two lines scribed on a single bar of platinum-iridium alloy.
The current definition of the metre is much more precise and accessible. One metre is defined as the length of the path travelled by light in a vacuum during the time interval of 1/299 792 458 th of a second.
This modern definition takes advantage of the constancy of the speed of light, as well as the capability technology has given us to measure time and the speed of light with great precision.
The light-year is another length standard defined in terms of time and the speed of light. It is equal to 9.47 × 1012 km.
This entry was posted by Blogpur, on
Saturday, January 14, 2006.
You can leave your response.
4:23 AM
Nice post! Life is so much easier with the meter. Conversion between miles and km is the least I can do. Imagine a life with yards and furlongs.
BTW I am hosting the Scian Melt tomorrow. Come check and have fun!
3:42 AM
Yards and furlongs! Actually I recently bought a calculator (Casio 991ES) which has all these conversions from metric etc. It is such a big help. Gallons to litres, km to miles. Can't believe you americans still use the mile!
and call petrol gas!
btw... what do you call LPG?
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