Abstract
The second is the base unit effectively defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between hyperfine levels of the ground state (0 K) of the caesium atom 135Cs.
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Gupta, S. (2020). Realization of the SI Base Units (S, M, Kilogram). In: Units of Measurement. Springer Series in Materials Science, vol 122. Springer, Cham. https://doi.org/10.1007/978-3-030-43969-9_6
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