The phrase "a decrease in density" is correct and usable in written English.
It can be used in contexts discussing changes in physical properties, such as in science or engineering, where density is a relevant factor.
Example: "The experiment showed a significant decrease in density as the temperature increased."
Alternatives: "a reduction in density" or "a decline in density".
When the temperature is higher than 1650 °C or when the heating time is longer than 2 h, a decrease in density is observed.
Density measurement showed a decrease in density with increasing PEN content indicating a reduction of the percent crystallinity of the blends as compared to the unblended homopolymers.
Disturbance by the horses, mainly through trampling, caused numerous paths to form within the glossy buckthorn-dominated understory and led to a decrease in density of stems of lower height classes (30 80 and 81 130 cm, respectively).
We observe a decrease in density of states near the Fermi level with increasing amount of Cu and a shift of the d-band center away from the Fermi energy.
Furthermore, the physical changes during post thermal treatment probed by calculating the film-density using the Lorentz-Lorenz relation indicate a decrease in density that supports the changes in chemical composition and optical properties.
The redox reaction influenced the sintering behavior of CeO2, resulting in a decrease in density and microcracking for the hydrothermally synthesized nano-size CeO2 powder compacts, and sagged points in the sintering curves for the chemically precipitated and commercial micron-size CeO2 powder compacts.
In contrast, analysis of the bone mineral density in human subjects with OA reveals a decrease in bone density related to thinning and loss of bone trabeculae [ 6].
In fasted cod cholesterol in high density lipoprotein (HDL) increased in serum whereas there was a decrease in low density lipoprotein (LDL) [ 71].
Magnetic Resonance Q Mapping Reveals a Decrease in Microvessel Density in the arcAß Mouse Model of Cerebral Amyloidosis.
Moreover, a decrease in bacterial density or flow rate enhanced bacterial retention.
In the past, it was widely believed that a decrease in bone density was the main cause of osteoporotic fractures.
