Question

What is time? How is one second time defined in the SI system.

Answer 1

Answer:

Time is the indefinite continued progress of existence and events that occur in an apparently irreversible succession from the past, through the present, into the future.

The second is defined in terms of a cesium-atom laser and its vibrations.

However, real time is defined in terms of the mean solar day, and it is thus necessary to add leap seconds to the atomic clocks to keep them in line with the astronomical clocks.

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