This model validates the use of the mixing volume with air flowing into and out of the volume and trace substances added to the volume.
The model volDyn
uses a dynamic balance,
whereas the model volSte
uses a steady-state balance.
The mass flow rate starts positive and reverses its direction at t=5 seconds.
bou(C={0.003})
to avoid a negative value for
C_outflow
of the steady state volume.