The phrase "a reduction in density" is correct and usable in written English.
It can be used in contexts discussing changes in physical properties, such as materials science, biology, or environmental science.
Example: "The experiment showed a significant reduction in density of the material after the heating process."
Alternatives: "a decrease in density" or "a decline in density".
Millennium Towers was so welcome -- among city officials, anyway -- that Mayor Bret Schundler and the City Council granted the project a 20-year tax abatement and a waiver of the area's normal 110-foot-height limit, which is intended to preserve the view from atop the Palisades, in exchange for a reduction in density.
We also observed a reduction in density variability along the same gradient.
SCPs with AM gum powder showed a considerable decrease in total shrinkage, a reduction in density values, an increase in fresh state viscosity.
While there was a reduction in density and tree extent with age for both sexes, this reduction was more pronounced for males, resulting in a disappearance of most sex differences with age.
The histopathological analyses of diabetic rats also showed a reduction in density of collagen fibers, fibroblasts and blood vessels.
IBS-GS was slightly more accurate than IBD-GS at the highest marker densities, but also considerably more sensitive to a reduction in density.
To achieve a similar reduction in average gait score by manipulating stocking density alone would require a reduction in stocking density of 18.5 kg/m2.
Genetic gain was robust to a reduction in marker density, with only moderate reductions, even for very low densities.
The tipping point for a reduction in badger density at which a cattle risk reduction becomes a cattle risk increase is not known.
"There's a reduction in bone density, there's loss of muscle and vision can be affected".
An observation of the cross-sectional image suggests a reduction in packing density in yarns after both the treatments.
