Precise measurements of physical quantities are a need of science. For example, to ascertain the speed of an aircraft, one must have an accurate method to find its positions at closely separated instants of time. This was the actual motivation behind the discovery of radar in World War II. Think of different examples in modern science you can, give a quantitative idea of the precision needed.

Explanation

In modern science accurate measurement is necessary. For example in statellite launch system time of `1mus` accuracy is required.
While dealing with LASER distance (length) `1Å(1Å=10^(-10)m)` measurement is required.
Also in measurement of size of nucleus accuracy of `10^(-15)m` is required. When mass of molecule is measured by using mass spectometer accuracy of `10^(-30)` kg is required.