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 where precise measurements of length, time, mass etc, arc needed. Also, where ever you can, give a quantitative idea of the precision needed.

Explanation

Preciese measurements of physcial quantites like length, mass and time are the primary requirements fro
development fo quatitative laws of Physics or any other science.
For example in the measurement of distance of moon form earth by Laser beam, very accurate measurement
of time taken is required. Similoarly, for measuring distance, elevation and velocity of an aeroplane by Radar method, time measruement has to be accurate. For measurig distance of nearby stars, accurate
measurement of parallax angle is required.
in the field of crystallography, precise measurement of lenght is needed to determine interatomic distaances.
Using a mass spectrometer. the precision measurement of masses of atoms are made.