Continuity Equation
The equation expressing conservation of mass for fluid flow through a pipe or conduit.
Governing formula
A1 v1 = A2 v2 = constant (Volumetric Flow Rate Q)
SI unit
m³/s
In depth
For incompressible fluids, constricting pipe cross-section area (A2 < A1) forces fluid velocity to increase (v2 > v1).
Examples in the real world
Squeezing the end of a garden hose to narrow the opening and shoot water out at higher speed.