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Measurement processes must be described in terms of the quantity which we want to describe quantitatively. Thus we can want to do a measurement of quantity 'time', or of the quantity 'temperature', or of the quantity 'electric current'. In chemical measurement, we may want to do a measurement of the quantity 'amount (of substance)', or of a derived quantity such as concentration (amount per volume), or content (amount per mass), or mass fraction (mass per mass). Provided our result is stated in terms of the quantity announced a priori and hence in the internationally agreed units for that quantity, that is OK. A problem only arizes when we intend to measure one quantity, yet report or claim to have measured another quantity. This frequently occurs in chemical measurement.: an amount is, or at least implied, and mass is used. Both are useful, but internal consistency and compatibility in executing and reporting the measurement is to be strongly recommended. We do not announce a temperature, then report the results in ampere, although we measure the electric current generated by a thermocouple. Therefore, In chemical measurement, we report an amount per volume (=concentration), an amount per mass (=content), mass per mass (=mass fraction).

Additional information

Authors: DE BIEVRE P, IRMM Ispra (IT)
Bibliographic Reference: Paper presented: IUPAC-ISO/REMCO Workshop, Berlin (DE), April 22-23rd, 1999
Availability: Available from DG XIII as Paper EN 42073 ORA
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