What does V represent in the air monitoring formulas?

• A. Volume of air in liters
• B. Velocity of air
• C. Volume of air in cubic centimeters
• D. Volume of air in liters per minute

Answer: (A)

In air monitoring formulas, V represents the volume of air being considered or sampled, usually expressed in liters. This matters because many calculations connect the amount of contaminant collected to how much air was drawn through the sampler, so the volume sets the basis for converting measurements into concentration or mass. Using liters as the unit keeps the calculations consistent and practical; cubic centimeters would work as a volume unit but are less common for these contexts. A rate like liters per minute describes how much air passes through per unit time, not the total air volume sampled, and velocity denotes a different physical quantity altogether. So V is the volume of air in liters.