In standard used to compare the outcome of a test?

Answer 1

There are hundreds of standard methods for making measurements, and each method will offer the accepted standard in the field. Standards exist with such organizations as ISO. ASTM, your local Standards Institute, and so on.

If you were measuring mass, then the equipment should be traceable to the appropriate national or international standards for mass.

Increasingly, there is a trend to attempt to define standards in terms of natural processes. 'How many atoms of Silicon will weigh 1 kilogram.' would be typical of a current search.

The measurement of length is now defined in terms of the wavelength of a particular atomic transition. The measurement of time is similarly defined in terms of a specified number of cycles of some natural radiation.

Answer 2

Control