The phrase "a change of quantity" is correct and usable in written English.
It can be used when discussing variations or modifications in amounts or numbers in various contexts, such as economics, science, or general discussions about measurements.
Example: "The experiment showed a significant change of quantity in the results after the new variable was introduced."
Alternatives: "a shift in quantity" or "an alteration in amount".
It is suggested that a change of focus from water quantities (i.e. river discharge in m3) to encompass a broader perception including water quality and economic and environmental benefits that can be derived from water use, could promote more agreeable environmentally acceptable solutions.
He then posits four types of causes to explain natural change (whether substantial, i.e., coming to be and passing away, or accidental, i.e., change of quantity, quality or place).
The change of quantity and binding affinity of the μ-opioid receptors brought about by the A118G SNP has been implicated for the observed effects of this SNP [19].
a Change of cell mass and crude oil quantity in ZS1 culture.
A change of direction, just as much as a change in the 'quantity of motion,' is in fact as mysterious and inexplicable, if done by incorporeal means, as the introduction of energy into the system would be.
The colour of many enamels is achieved by a change in the proportion of the components of the flux rather than by a change in quantity of the oxide.
In the 18th century the most fertile equation of this kind was the vibrating string equation, derived by the French mathematician Jean Le Rond d'Alembert in 1747 and relating to rates of change of quantities arising in the vibration of a taut violin string (see Musical origins).
Seventeenth-century mathematicians, culminating with Isaac Newton and his arch-enemy Gottfried Wilhelm Leibniz, had founded calculus — the study of the rates of change of quantities in time (differentials or derivatives) and the intimately related idea of areas between curves (integrals).
Second, the variables in equation (4) are defined as the relative change of quantities and prices, easily quantified by using available data usually expressed in index numbers.
Salvatore [29] defines returns to scale as the extent to which health system output changes as a result of a change in the quantity of all health system inputs used in production.
