Physics for Everyone: Guide to Basic Physics #3 The International System of Units
The 11th General Conference on Weights and Measures, held in Paris from 11 to 20 October 1960, adopted the six units that should serve as a basis for the establishment of a practical measurement system for international relations.
- The metric system based on the six basic units above is designated by the name of the International System of Units
- The international abbreviation of that system is SI
The International System is based on the adoption of seven fundamental values: the four of the rationalized mksA system, or the Giorgi system, and that is the length, the
mass, time intervals, light intensity and amount of substance. The corresponding measuring units are defined as follows:
The Ampere (A), that is, the constant electrical current, which, when flowing in two straight, parallel, indefinably long, circular cross sectional, spaced 1 m in the void, determines between them a force of 2 *(10^(-7)) N for each meter of conductor.
The meter (m) or the distance traveled by the light in the time interval of (1/299792458) s.
Kg (kg) or the mass of the platinum-iridium prototype deposited at the Bureau International des Poids et Mesures in the subterranean halls of the Breteuil Pavilion in Sevres.
The second (s), ie the duration of 9 192 631 770 oscillations of the radiation emitted by the cesium 133 (133Cs) atom in the fundamental state 2S 1/2 in the transition from the iperfine level F = 4, M = 0 to the iperfine level F = 3, M = 0.
The Kelvin (k), or fraction of 1 / 273.16 of the thermodynamic temperature of the triple point of water.
The candle (cd) is the luminous intensity in a given direction of a source that emits monochromatic radiation of 540 * (10 ^ 12) Hz and whose energy intensity in this direction is (1/683) W / sr.
The mole (mol), or the amount of substance of a system that contains so many elementary units as are the atoms in 0.012 Kg of carbon 12 (12C).
The radian (rad), that is, the plane corner with the vertex in the center of the circumference which underlies an arc of length equal to the radius.
The steradian (sr) or that solid corner with the vertex in the center of the sphere which underlies a spherical shell, the area of which is the same as that of a square with sides equal to the radius of the sphere.
Very very good post my friend, You win my reSteem!!
Congratulations @chtulu! You have completed some achievement on Steemit and have been rewarded with new badge(s) :
Award for the number of upvotes received
Click on any badge to view your own Board of Honor on SteemitBoard.
For more information about SteemitBoard, click here
If you no longer want to receive notifications, reply to this comment with the word
STOP
Congratulations @chtulu! You have completed some achievement on Steemit and have been rewarded with new badge(s) :
Award for the number of comments
Click on any badge to view your own Board of Honor on SteemitBoard.
For more information about SteemitBoard, click here
If you no longer want to receive notifications, reply to this comment with the word
STOP
Congratulations @chtulu! You have completed some achievement on Steemit and have been rewarded with new badge(s) :
Award for the number of upvotes
Click on any badge to view your own Board of Honor on SteemitBoard.
For more information about SteemitBoard, click here
If you no longer want to receive notifications, reply to this comment with the word
STOP
Congratulations @chtulu! You have completed the following achievement on Steemit and have been rewarded with new badge(s) :
Award for the number of upvotes
Click on the badge to view your Board of Honor.
If you no longer want to receive notifications, reply to this comment with the word
STOP
Do not miss the last post from @steemitboard:
SteemitBoard World Cup Contest - France vs Belgium
Participate in the SteemitBoard World Cup Contest!
Collect World Cup badges and win free SBD
Support the Gold Sponsors of the contest: @good-karma and @lukestokes
Congratulations @chtulu! You have received a personal award!
1 Year on Steemit
Click on the badge to view your Board of Honor.
Do not miss the last post from @steemitboard:
SteemitBoard World Cup Contest - The results, the winners and the prizes
Congratulations @chtulu! You have completed the following achievement on the Steem blockchain and have been rewarded with new badge(s) :
Click here to view your Board of Honor
If you no longer want to receive notifications, reply to this comment with the word
STOP
Congratulations @chtulu! You received a personal award!
You can view your badges on your Steem Board and compare to others on the Steem Ranking
Vote for @Steemitboard as a witness to get one more award and increased upvotes!