The phrase "a reduction in the quantity of" is correct and usable in written English.
It can be used when discussing a decrease in the amount of something, often in contexts like economics, science, or resource management.
Example: "The study showed a reduction in the quantity of plastic waste produced by the company over the last year."
Alternatives: "a decrease in the amount of" or "a decline in the volume of".
Pleading the danger of Bolshevism in a nation on the verge of collapse, the German delegation obtained some mitigation of these terms: a suggestion that the blockade might be relaxed, a reduction in the quantity of armaments to be handed over, and permission for the German forces in eastern Europe to stay put for the time being.
The overall effect of power losses on the system is a reduction in the quantity of power available to the consumers.
The decrease in the ratio of the D/G bands may be explained in terms of an increase in the crystallite domains or a reduction in the quantity of amorphous carbon.
A reduction in the quantity of β-cells in hyperglycemic individuals was described over 110 years ago by Eugene Opie (1) in an elegant report that included hand-drawn color micrographs.
To achieve detection of alleles with MAF < 4.5% a reduction in the quantity of sequence targeted for enrichment and/or number of pools per sequencing lane would be required.
Electricity and fuel shortages are leading to a reduction in the quantity and quality of health care and water accessible to children.
This may lead to a reduction in the quantity and quality of care globally, which would reversing the substantive progress that has occurred over the past 20 years.
Davies's fellow Westminster councillor Heather Acton confirmed that a 40% reduction in the quantity of buses is being worked on in conjunction with Transport for London (TfL).
This procedure resulted in greater than 80% reduction in the TRPM5 mRNA levels and a 50% reduction in the quantity of PMA dependent MUC5AC secreted by starved cells.
Across a range of parameterized designs, we observe up to 50× reduction in the quantity of data fetched from external memory.
A systematic reduction in the solvent content of protein crystals has demonstrated that reduction in the quantity of surrounding water affects the hydration shell of proteins, shrinks the crystal lattice and improves the crystal packing and diffraction resolution [23] [25].
