Discussion
Which of the following is not true of the steady state mass balance for a room?
Answer: D
Correct answer: The steady concentration is proportional to the room volume
Volume does not appear in the steady state at all. The balance is
\[ C = C_{out} + \frac{G}{Q} \]
so only the outdoor concentration, the source strength and the ventilation flow determine it.
The other three statements are true, including the role volume does play: it sets the time constant \( V/Q \) governing how quickly the steady value is approached. Volume affects the dynamics, not the equilibrium.
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