What is the relationship of flow rate and sample volume in determining sampling time?

The relationship between flow rate and sample volume in determining sampling time is inversely proportional. This means that when the flow rate increases, the sampling time decreases to obtain the same sample volume, and vice versa.

To illustrate this, consider that sampling time is calculated by the formula:

Sampling Time = Sample Volume / Flow Rate

If the flow rate is increased, it allows for a greater volume to be collected in a shorter period, thus reducing the time required for sampling. Conversely, if the flow rate decreases, it takes longer to collect the same volume. This inverse relationship is critical in industrial hygiene, as it allows professionals to optimize their sampling strategies based on available equipment and the desired sample volume.