The rate of change of volume measures how fast the volume (of fluid of a system) is changing

Left: How to find the rate of change graphically. Right: Relationship between rate of change and change incurred during a period.

delta_V: change of volume (from t1 to t2). If the rate of change is constant, the change is calculated simply by

     delta_V = dV/dt*delta_t ,     delta_t = t2 – t1

Relation between volume currents (with respect to a system) and the rate of change of volume of that system (law of balance of volume):

     dV/dt = I_V1 + I_V2 + I_V3 + …

[dV/dt] = m^3/s

change of volume, volume,

If the volume is increasing with time, its rate of change is given a positive value.

Änderungsrate des Volumens