# conservation-of-mass

It can be seen by inspection of the equations (6.6) that a conservation-of-mass law is satisfied: noting that in the usual experiment ${\displaystyle x_{2}\left(0\right)=0=x_{3}\left(0\right)}$, it is ${\displaystyle x_{1}\left(t\right)+x_{2}\left(t\right)+x_{3}\left(t\right)=x_{1}\left(0\right)}$.