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Transport Processes and Separation Process Principles (Includes Unit Operations) Fourth Edition by Christie John Geankoplis

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1.5. CONSERVATION OF MASS AND MATERIAL BALANCES

1.5A. Conservation of Mass

One of the basic laws of physical science is the law of conservation of mass. This law, stated simply, says that mass cannot be created or destroyed (excluding, of course, nuclear or atomic reactions). Hence, the total mass (or weight) of all materials entering any process must equal the total mass of all materials leaving plus the mass of any materials accumulating or left in the process:

Equation 1.5-1

In the majority of cases there will be no accumulation of materials in a process, and then the input will simply equal the output. Stated in other words, “what goes in ...

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