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Lect 17 mass accounting

# Lect 17 mass accounting - Chapt er 18 Account ing for M ass...

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Chapter 18 Accounting for Mass Why is Conservation of Mass Important?

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Conservation Law - Words Conservation Law : When an EP is conserved, it is neither created nor destroyed , despite any changes to the system or surroundings. When an EP is conserved, the amount or rate of that EP is unchanged in the universe at all times (except nuclear reactions). The total amount of a conserved property in the universe is a constant.
Conservation Law - Eqn Input – Output = Accumulation In – Out = Acc In/Out: Capture exchange or transfer of EP into and out of a system. Gen/Con: Production or elimination of EP within a system Acc: Quantity that has collected in or been depleted from the system.

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Application of Conservation Eqn Conservation Eqn can be written for a subset of EP’s for which we could write Accounting Eqns. Total mass Element mass and moles Linear and angular momentum Net charge Total energy Conservation Eqn can’t be applied to the others (e.g., Mech E, entropy, money, positive charge…).
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