The phrase "a constant quantity of" is correct and usable in written English.
It can be used in contexts involving measurements, science, mathematics, or any situation where a specific, unchanging amount is being discussed.
Example: "In physics, we often refer to a constant quantity of energy when discussing closed systems."
Alternatives: "a fixed amount of" or "an unchanging quantity of".
This law expresses the inverse relationship that exists between the pressure and volume of a gas, and it was determined by measuring the volume occupied by a constant quantity of air when compressed by differing weights of mercury.
A constant quantity of this background electrolyte (100 mL) was transferred into three different flasks kept in series.
In general, increasing the size of the negative training set (with a constant quantity of positives), led to decrease in recall and improvement in precision, whereas no significant effect on AUC values was observed.
At high scan rates, the copolymer contains a constant quantity of Fe CN 3−/4−6 because the excess positive charge in the film produced by the oxidation of Fe CN 4−6 is balanced by HPO2−4 insertion.
The results show that to obtain samples that have a constant quantity of graphite, sintering experiments should be performed at a much lower fO2 (<10−4 Pa) with a gas other than argon (e.g., CO/CO2 gas mixes) or under high-vacuum conditions (about <10−3 Pa).
Then, a constant quantity of FL-MMP-11 was incubated with varying Cat-MMP-14 quantities.
With this assumption together with the further implicit assumption that the free energy of hydration of an ion was a constant quantity, independent of the identity of its companion ion or ions, free energies of hydration of other cations were calculated from the free energies of hydration of their chlorides and free energies of hydration of other anions from their K+ salts.
Biotinylated peptides allowed coating of a constant quantity and steric hindrance was minimised by the presence of an arm of an ε-aminohexanoic acids (Ahx) and two glycin residues (except for peptide representing VB7 without glycin), permitting a better epitope presentation and a potentially more efficient antibody recognition.
Volume contraction causes a rise in plasma bicarbonate concentration because there is contraction of the extracellular volume around a relatively constant quantity of extracellular bicarbonate [ 8].
After the three-dimensional network has been constructed (the percolation threshold) where MWCNT content was of 1.2 wt.%, the density of CNT-CNT junctions tend to be a constant quantity, resulting in a stabilized conductivity of the fibers.
