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3 cards from this section. Quick, good the night before a test.
Define unsteady state.
Think about how concentrations behave in dynamic systems.
What is a mass balance?
Consider inputs, outputs, and changes in accumulation.
What is the key difference between unsteady state and steady state?
Remember how systems vary over time.
True or False: A mass balance looks at the rate of accumulation and the rate of loss.
Think about how inputs and outputs affect overall mass.
If a river segment has an inflow of pollution at a concentration of 5 mg/L and outflow at 3 mg/L, calculate the net accumulation rate if the flow rate is 100 L/min.
Use the mass balance principles you learned.
Model a scenario in which a lake's concentration of a pollutant increases due to a chemical reaction producing it at a rate of 50 mg/day while evaporation removes 20 mg/day. If the lake volume is constant, determine the new concentration after one day.
Consider using the mass balance formula for calculations.
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