2.1 - Initial Conditions and Mass Accumulation
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Practice Questions
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Define mass balance in your own words.
💡 Hint: Think about how inputs and outputs relate.
What is evaporation?
💡 Hint: Consider what happens to water in a pot on the stove.
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Interactive Quizzes
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What does the mass balance equation express?
💡 Hint: Focus on the relationship between what's coming in and going out.
True or False: Evaporation plays no role in the mass balance of pollutants.
💡 Hint: Remember how pollutants can enter the air.
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Challenge Problems
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A factory continuously admits 500 kg of a pollutant every week into a lake while 200 kg are evaporated. Calculate the total mass of the pollutant after 4 weeks and discuss the implications.
💡 Hint: Use the mass balance equation to track inputs and outputs.
If the lake has an initial concentration of 4400 kg of a pollutant and it is diluted by a rainfall of 1000 cubic meters with a clean water influx, what happens to the concentration?
💡 Hint: Consider how dilution works when additional water is introduced.
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