| |
|
|
| |
 |
| Measurement of Time |
|
| Thus just as length has units like
kilometer, meter, centimeter, millimeter etc., time also has units like
year, month, day, hour etc. You must have been hearing quite a lot about the
ending of the millennium and starting of the third millennium in the year
2001. Here we have larger units measuring more time - thousand years. A
millennium consists of 10 centuries. Each century consists of 100 (years)
and in the range we finally come to the "second". One second is the smallest
unit of time that we can see in clocks and watches by the clicking of the
second hand. |
| |
| In the past when there were no clocks people used water clocks, the hour glass, candle clocks and the sun dials. |
| |
 |
| |
| We must thank Galileo Galilei for replacing all these devices by clocks and watches. Some of them are so accurate that they are beyond our imagination. The pendulum that you see in wall clocks started this replacement and Galileo was responsible for this. |
| |
| Galileo is considered to be the father of modern science. In 1583, he discovered that the time taken for a single oscillation of a pendulum of a given length is always constant. This paved the way for the use of pendulum for controlling the time element in the clocks. |
| |
|
|
| |
|
|
| |
|
|
|
|
|
Get FREE Live Tutoring
(No credit card required)
Measurement and Experimentation
|
|
|
