ABSTRACT
Measurements play an essential part in physics, and the purpose of measurement is to acquire a number or numbers that accurately represent the values of the measured physical quantities under consideration. However, it would be impossible to relate the experimentally obtained numbers to their physical quantities without defining a standard, to which they could be compared and then documented. For example, it would be insignificant to say that a certain quantity has a mass of 300 g without having in mind a standard of mass for comparison. The standard of mass of 1.000 kg makes the comparison so clear because we understand then that 300 g are 300 parts of 1000 parts that make 1 kg. The same applies to length and time.
