Who decides how long a second is? | John Kitching

The video explores the evolution of time measurement, from ancient calendars to the precise definition of a second using atomic clocks. It highlights the historical context of timekeeping, the development of atomic clocks based on quantum mechanics, and the selection of cesium 133 as the standard for defining a second. The video concludes with the impact of atomic clocks on global time synchronization.

What characteristics did researchers look for in an atom to define a second?

How was the number of ticks of a cesium atom defined as one second?

In what ways are atomic clocks utilized in modern technology?