People have different lengths of feet, so what would be one foot for one person would not be one foot for another person. But why is invariability important? Invariability is important because it allows for universal communication: what is three meters here will be three meters there, and thus anyone from any place can read about three meters and know how long it is.
It also means that if something is three meters today, it would be three meters after ten years if nothing has changed about it.
Having a standard is not the end itself however. There needs to be ways of measuring based on the standard. If we have the standard for mass, we would need to work out a way to find out how heavy something is based on that standard. Whether it be a hydrogen atom or an apple or the sun, there needs to be ways to measure their mass based on that standard.
An example for this is the weighing scale: it approximates the standard for mass. Other ways need to be devised if you want to measure the mass of the sun, for example, through indirect measurement. Of course, the world didn't start out using standards. Things were initially measured arbitrarily. However, scientists recognized the value of standards.
The International System of Units, popularly known as the metric system, had its roots in the French Revolution with only two standards: the meter and the kilogram for length and mass. The SI was made to establish an international standard, applicable anywhere. It is based on seven base units, the set on which all other SI units are derived from. Base units are the basis for all other SI units.
The small reading reduces the error of the calculation. We always used measurements, when … Contemporary Physics: Vol. Derived units are those units which cannot be expressed in the absence of fundamental units.
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