Mass Balance for Open Systems
Change in the Total
Mass of the System
Mass of the System
=
Total
Mass of the
System at Final State
System at Final State

Total
Mass of the
System at Initial State
System at Initial State
Differential Mass Balance :
Change in the Total
Mass of the System
Mass of the System
Total
Mass
Leaving the System
Leaving the System
Total
Mass
Entering the System
Entering the System
=

Integral Mass Balance :
Open
System
System
Conservation of Mass Principle (or Mass Balance)
Mass cannot be created or destroyed. Therefore, as we did for energy, we must account for all mass flows that cross the system boundary.
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