In rotameter calculations, AV stands for which value?

• A. Calibrated Value of Liters
• B. Actual Liters Collected
• C. Average Volume
• D. Ambient Volume

Answer: (B)

The main idea here is tracking the actual amount of air that has passed through the sampler. In rotameter calculations, you use the actual liters collected, which is the total volume of air that was drawn through the sampler during the sampling period. This is found by taking the flow rate shown on the rotameter and multiplying it by the sampling time, giving you the actual liters collected (for example, 1 L/min for 60 minutes yields 60 liters).

Why this matters: the concentration of a contaminant in the sample is typically calculated using the actual volume collected, not a theoretical or calibrated value. Using the actual liters collected ensures the result reflects what was truly sampled under the working conditions.

The other phrases don’t fit because they describe either an expected or theoretical volume (calibrated value), a broader average over time (average volume), or the surrounding environment rather than what was actually collected (ambient volume).