The law expressing the relationship between rates of change of volume of a system and the sum of all volume currents (fluxes) with resprect to that system.

In integrated form, the relation is between the change of volume (for a period of time from t1 to t2) and the transported volumes of fluid.

Left: Representation of a system (with boundary, and volume stored) and flows into and out of the system. Right: System dynamics diagram representing the idea of the balance of volume.

Instantaneous form (dynamical form)

     dV/dt = I_V1 + I_V2 + I_V3 + …

Integrated form:

     delta_V = V_e1 + V_e2 + V_e3 + …

(general) law of balance, volume, rate of change of volume, volume current, change of volume, transported volume,

The volume of a fluid (representative of its amount of substance) is a substancelike quantity for which a law of balance holds. It can be stored, and it can flow.

If chemical reactions are allowed, the volume of a substance can be produced or destroyed as well. In the case of gases, compression and expansion is a destruction and production of volume.

Volumenbilanz, Bilanz(gesetz) des Volumens