The phrase "per unit volume" is correct and can be used in written English.
For example, you could write: "This material is lighter per unit volume than any other material on the market."
By definition, then, a has units of A per unit volume.
Per unit volume, a fuel cell should be able to provide five times more energy than the lithium battery.
Hydrometer, device for measuring some characteristics of a liquid, such as its density (weight per unit volume) or specific gravity (weight per unit volume compared with water).
This, in turn, means more smoke per unit volume, and thus more tar and nicotine.
Then it would have been a simple matter of calculating the mass per unit volume.
Archimedes knew that silver and gold had different weights per unit volume.
Vertical incidence produces more ionization per unit volume than slant entry.
Molecular concentration is the number of molecules of a particular component per unit volume.
= Kinetic energy per unit volume.
Body force per unit volume (N/m3).
Percentage of injected activity per unit volume.
