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4) The SI unit of time is second. why​?
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4) The SI unit of time is second. why​?

User Svckr
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What the person up top said.. I was gunna explain but they person up top said everything correctly
User MartinVeronneau
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Answer:

Second, fundamental unit of time, now defined in terms of the radiation frequency at which atoms of the element cesium change from one state to another. The second was formerly defined as 1/86,400 of the mean solar day—i.e., the average period of rotation of the Earth on its axis relative to the Sun.

source britannica

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User Matsev
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