The original version of the atomic clock, built in the 90's, was the size of a household washing machine! Today, the physical part of the clock with an atomic cell on its back containing the atoms measures just 4 mm across. Because it relies on the radiation emitted by atoms, this clock can measure time extremely accurately.
Find out more about the intricacies of atomic clocks in the full version of this episode of 'do you know?': [ Ссылка ]
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