second definition time

second - an indefinitely short time; "wait just a moment"; "in a mo"; "it only takes a minute"; "in just a bit" Submit your e-mail address below. … More about the redefinition It is one of the seven SI base units. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. The second is defined by taking the fixed numerical value of the caesium frequency ∆ ν, the unperturbed ground-state hyperfine transition frequency of the caesium 133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s −1. It is the time required for an Engineers and scientists often use smaller units than the second by attaching power-of-10 The second is sometimes specified as a unit of angular measure, especially in astronomy and global positioning.

Sixty arc seconds comprise an arc minute; 60 arc minutes comprise an angular degree. The second is defined as the duration of 9,192,631,770 cycles of the radiation associated with a specified transition, or change in energy level, of the cesium-133 atom.… 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 North America, electricity is generated at 60 Hz, which means that the electrons move forward, then back again, 60 times in one second . History at your fingertips That means that the second is used to build the foundations of many other units. The second (abbreviation, s or sec) is the Standard International ( SI) unit of time. It …

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