The phrase "a reference quantity" is correct and usable in written English.
It can be used in contexts where you need to specify a standard or baseline measurement for comparison or analysis.
Example: "In this experiment, we will use a reference quantity to determine the accuracy of our results."
Alternatives: "a benchmark value" or "a standard measurement".
In that year, it was allocated a reference quantity of 23.5 million tonnes, putting it in second place behind France.
Directional relay algorithm based on phasor components either uses voltage or current information as a reference quantity.
For quantification, a reference quantity is necessary as well.
We have seen in "Measurement Accuracy" that it is the difference between a unique measured quantity value and a reference quantity value.
Measurement trueness is the closeness of agreement between the average of an infinite number of replicate measured quantity values and the true or a reference quantity value.
These terms are defined as the extreme value of measurement error, with respect to a known reference quantity value, permitted by specifications or regulations for a given measurement, measuring instrument, or measuring system.
When only one single mass flow rate is involved, an entropy based approach is straight forward since the flow rate can be used as a general reference quantity.
The laminar flame speed sl is an important reference quantity for characterising and modelling combustion.
It is arbitrary, which particular example of the reference quantity a unit would be, and as a result there are many different units that correspond to particular quantities.
The median ratios of the two signal to noise ratios are 1.12, 1.16 and 1.76 for 100 ng, 50 ng or 10 ng respectively comparing to a reference starting quantity of 250 ng.
This creates problem for directional relay using negative sequence voltage as reference quantity.
