The measurand is defined as a physical quantity to be measured (such as length, weight, and angle). The specification of a measurand requires:

  • the knowledge of the species of physical quantity;
  • the description of the state of the phenomenon, of the body or of the substance of which the physical quantity constitutes a property (including all the relevant components);
  • the chemical entities involved.

It is essential to underline that the term “measurand” does not refer to the object or phenomenon on which a measurement is being performed, but to a specific physical quantity that characterizes them. For example, when we detect the temperature of a liquid, the measurand is not the liquid, but its temperature.

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