Know about Measurement of time

We need a clock to measure any time interval. Atomic clocks provide better standard for time. Some techniques to measure time interval are given below.

23 Quartz clocks
The piezo−electric property* of a crystal is the principle of quartz clock. These clocks have an accuracy of one second in every 109 seconds.

Atomic clocks
These clocks make use of periodic vibration taking place within the atom. Atomic clocks have an accuracy of 1 part in 1013 seconds.