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The SI (metric) unit of time is the second.

The second is technically defined thus:

The second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom.

The cesium atom must be at rest at 0o K (absolute zero temperature).

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16y ago
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16y ago

Seconds are units so the question cannot be sensibly answered. Seconds are both units of time (one sixtieth of a minute) and units of angle (one sixtieth of minute) Seconds of time would be measured using an accurate clock like a stopwatch.

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7mo ago

The SI unit for time is the second (symbol: s). It is used to measure duration, intervals, and frequencies.

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15y ago

a second is an SI unit, it measures time.

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Q: What is the si units of second?
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