cesiumsekunti

Cesiumsekunti is a concept related to the definition of the second, the SI base unit of time. While the second is fundamentally defined by the frequency of microwave transitions in cesium-133 atoms, the term "cesiumsekunti" refers to the specific number of these oscillations that constitute one second. The current definition states that the second is realized by fixing the numerical value of the cesium frequency, ΔνCs, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s⁻¹. Therefore, a cesiumsekunti is precisely one second as defined by this cesium-133 atomic transition. This definition is crucial for metrology and ensures a universally consistent standard for timekeeping. The stability and reproducibility of the cesium-133 atomic clock have made it the international standard for defining the second for many decades. Understanding the cesiumsekunti is fundamental to grasping the precision and scientific basis of modern time measurement.