Dong ho nguyen tu
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<timefyi-glossary slug="atomic-clock"></timefyi-glossary>Định nghĩa
Dong ho su dung tan so cong huong cua cac nguyen tu (thuong la cesium-133) de giu thoi gian voi do chinh xac cao. Cac dong ho cesium hien dai mat it hon 1 giay trong 100 trieu nam.