Since long, man has used clocks and watches to measure time. But those were crude watches and did not measure time accurately. A few years ago, scientists were able to develop a very sophisticated clock known as 'atomic clock'. With its development, a new era has been ushered in the field of time measurement. It is a wonder clock, that remains accurate to one second for 1,700,000 years.
Today we have mainly three types of clocks and watches – mechanical, electrical and electronic. Mechanical clocks and watches are spring-driven, electrical clocks are battery-powered and the electronic ones are quartz-based. All these clocks and watches show time quite accurately. But if they run continuously for long periods, they can get slow or fast.
Now, the smallest internationally accepted unit of time is the atomic second.
#clock #atomic #atomically
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