arabera Maria Maya Soto 2 years ago
149
Honelako gehiago
Kilometer
Time
Seconds
Temperature
Kelvin
Current intensity
Ampere
Luminous intensity
Candela
Amount of substance
Mole
It adopts the name of the international system of units and the acronym si. redefines the meter and second. set rules for prefixes
11a. CGPM, 1960
Decide on the liter and the cubic decimeter. the prefix femto and atto are introduced.
12a. CGPM 1964
Define the second in terms of the cesium atom 133. redefine the candela. add derived units. defines the unit of thermodynamic temperature
13a, CGPM 1967
Define and enter the mole as the seventh base unit. enter pascal and siemens
14a, CGPM 1971
Sets Coordinated Universal Time as the time scale (UTC) Enters the becquerel and gray . the prefixes exa and peta are added
15a, CGPM 1975
Redefines the candle. enter the sievert. the symbols l and L are established for the liter
16a, CGPM 1979
Redefine the meter based on the speed of light
17a, CGPM 1983
Enter the prefixes Z Y z y
19a, CGPM 1991
Eliminates the class of supplementary units within the SI context
20a, CGPM 1995
Sets the katal as derived SI units
21a, CGPM 1999
10a. CGPM, 1954