...orbital motion around the sun, by an "atomic definition." The Conference decided that: The unit of time of the International System of Units is the second,...abrogated the resolutions giving the earlier definition. The frequency (9,192,631,770 Hz) which the definition assigns to the cesium radiation was carefully...

...accurately than it could be done by astronomical means. So the second, since October 1967, is now defined as the duration of 9,192,631,770 periods of the radiation...hyper-fine levels of the fundamental state of the atom cesium 133. Our Institute for Basic Standards is actively involved in a variety of investigations associated...

...International System of Units is the second defined as follows: "The second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium-133 atom". 2 Resolution 1 adopted by the CIPM at its meeting of 1956 and...

...measurement of time. The 13th Conference (1967) abrogated the 1960 action and decided that: The unit of time of the International System of Units is the second,...hyperfine levels of the fundamental state of the atom of cesium 133." (iii) Temperature: The "kelvin," the unit of thermodynamic temperature, is the fraction...

...measurement of time. The 13th Conference (1967) abrogated the 1960 action and decided that: The unit of time of the International System of Units is the second,...hyperfine levels of the fundamental state of the atom of cesium 133." (iii) Temperature: The "kelvin," the unit of thermodynamlc temperature, Is the fraction...

...Units is the second, defined in the following terms: "The second is the duration of 9,192, 631,770 periods of the radiation corresponding to the transition...hyperfine levels of the fundamental state of the atom of cesium 133." (iii) Temperature: The "kelvin," the unit of thermodynamic temperature, is the fraction...

...element or "natural pendulum" has been the cesium atom. One second is defined in the official wording as "the duration of 9,192,631,770 periods of the radiation...transition between the two hyperfine levels of the ground state of the cesium-133 atom." Accordingly, the frequency of the cesium pendulum is 9,192,631,770...

...orbital motion around the sun, by an "atomic definition." The Conference decided that : The unit of time of the International System of Units is the second,...hyperfine levels of the fundamental state of the atom of cesium- 133." and abrogated the resolutions giving the earlier definition. Time and Frequency Services....

...of Units is the second, defined in the following terms: "The second is the duration of 9,192.631,770 periods of the radiation corresponding to the transition...abrogated the resolutions giving the earlier definition. The frequency (9,192,631,770 Hz) which the definition assigns to the cesium radiation was carefully...

...of Units is the second, defined in the following terms: "The second is the duration of 9,l92,63l,770 periods of the radiation corresponding to the transition...hyperfine levels of the fundamental state of the atom of cesium l33." (iii) Temperature: The kelvin, the unit of thermodynamic temperature, is the fraction...