If the volume (V) is 315 L and the time (T) is 90 minutes, what is the flow rate?

• A. 2.5 L/min
• B. 3.5 L/min
• C. 4.5 L/min
• D. 5.5 L/min

Answer: (B)

To determine the flow rate, you need to divide the volume of air or liquid by the time taken to pass through that volume. In this case, the volume is given as 315 liters, and the time is 90 minutes.

Flow rate can be calculated using the formula:

Flow Rate = Volume / Time

First, we need to convert the time from minutes to a standard unit of flow rate, which is typically expressed in liters per minute. Since there are 90 minutes in the time variable, the calculation becomes:

Flow Rate = 315 L / 90 min

When you perform this division:

315 ÷ 90 = 3.5 L/min

Therefore, the correct flow rate is 3.5 liters per minute. This aligns with the calculations for flow rate in an occupational hygiene context, where understanding the amount of substance moving through a system over time is essential for assessing exposure levels and ensuring worker safety.