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Apr 9, 2019 · The second is currently defined using cesium atoms, which absorb and emit microwave radiation with a specific frequency. Atomic clocks count 9,192,631,770 of those microwave oscillations, and we call the elapsed time interval a second. Today, commercially available cesium clocks keep time to within 1/3,000,000 of a second per year.
Apr 29, 2024 · 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. In the mid-20th century this definition became inadequate because of the need for increased precision in timekeeping. In 1956 the second was redefined by the International Committee on Weights ...
The second (symbol: s ), is a unit of time. There are 60 seconds in a minute, 60 minutes in an hour, and 24 hours in a day. This tradition dates back to the Babylonian . In science, a second is the time it takes for a caesium atom to vibrate 9,192,631,770 (around 9 billion) times. Scientists measure the second this way because the length of a ...
4 days ago · second (plural seconds) Something that is number two in a series. Something that is next in rank, quality, precedence, position, status, or authority. The place that is next below or after first in a race or contest. (usually in the plural) A manufactured item that, though still usable, fails to meet quality control standards.
Synonyms for SECOND: minute, moment, heartbeat, instant, split second, nanosecond, jiffy, trice; Antonyms of SECOND: age, eternity, forever, lifetime, eon, aeon ...
Second definition: next after the first; being the ordinal number for two.. See examples of SECOND used in a sentence.
