The phrase "a decrease in volume" is correct and usable in written English.
It can be used when discussing changes in sound levels, capacity, or quantity in various contexts, such as audio, physical measurements, or data analysis.
Example: "The recent adjustments in the audio settings resulted in a noticeable decrease in volume during playback."
Alternatives: "a reduction in volume" or "a drop in volume."
Moreover, SMAT pre-process resulted in a decrease in volume and area of internal porosity of coatings.
However, reducing the cooling regime did not guarantee a decrease in volume of voids, for which lower cooling regimes occasionally resulted in a higher percentage of voids volume.
Revenue from first-class mail, which provides the bulk of Postal Service revenue, declined $198 million, or 2.7 percent, from the same period last year, with a decrease in volume of 713 million pieces, or 4.1 percent.
Controlled modification of micropore volumes of samples from the FM1-series of activated carbon cloth can be achieved via selective oxidation: strong caustic treatment leads to an increase in volume, while peroxydisulfate treatment leads to a decrease in volume.
Revenue from first-class mail, which provides the bulk of the revenue for the Postal Service, declined $237 million, or 3.1 percent, from the same period the previous year, with a decrease in volume of 834 million pieces, or 4.5 percent.
Reduction in surface water inflow into the mire, diminished duration and degree of flooding, decrease in summer rainfall and increase in evapotranspiration have led to the substantial fall of the groundwater table in the valley and a decrease in volume of water stored in organic sediments.
This may be because of a decrease in fluid volume (blood) and changes in myocardial mass.
Vasopressin is also released in response to a decrease in blood volume.
The conclusion seems to be that all losses were due to a decrease in sales volume.
Furthermore, the decrease in 2-AG in that study correlated positively with a decrease in VAT volume.
Another found a decrease in the volume of the amygdala region, which is involved in processing the emotions of fear.
