The phrase "a function of the quantity of" is correct and usable in written English.
It is typically used in mathematical, scientific, or technical contexts to describe how one variable depends on the amount of another variable.
Example: "The total cost is a function of the quantity of items purchased."
Alternatives: "dependent on the amount of" or "related to the quantity of".
The stability of the passive film was investigated as a function of the quantity of oxide generated.
For further experimental investigations, a correlation is proposed to predict laminar burning velocity as a function of the quantity of O2 and CO2 in the gas mixture.
Such membranes were used to understand the changes in their physicochemical behaviour as a function of the quantity of polystyrene that is blended with the inorganic component while membranes having 25%% polystyrene were only selected for transport studies.
Price was also a function of the quantity of slaves available; in the 4th century BC they were abundant and it was thus a buyer's market.
The columns reflect variability in exposures as a function of the quantity of seafood consumed by different demographic groups.
For each reaction, real-time fluorescence values were measured as a function of the quantity of a reporter dye (6-carboxy-fluorescein [FAM]) released during amplifications.
We modeled the detection probability (p) as a constant (constant), as a function of tick race (tick race), and as a function of the bacteria quantity index using both linear (quantity) and quadratic (quantity) relationships.
According to the Cournot model, the price is a function of the production quantity.
The correction is built as a function of the first-approximation quantity itself.
The human cortex grows in size, develops complexity, makes synaptic connections and modifies as a function of the quality and quantity of sensory experience.
This is particularly true if the predicted future quantity of loss is not a stable average, but a function of the historic trend in quantities of loss [25].
