What does "C" equal in the formula C = Fd1 for a pressure-relief device?

The formula C = Fd1 is utilized in the context of calculating the mass flow rate of air through a pressure-relief device. In this formula, "C" represents the quantity of air that is flowing, and it is measured in pounds per minute. The term "pounds/minute" is a standard unit used to express the mass flow rate of gases, including air, as it directly relates to the weight of the substance passing through a given point in a specified amount of time.

In this context, understanding that "C" denotes the mass flow rate in pounds per minute is crucial for applications like pressure-relief devices, as it helps engineers and technicians ensure that the device can adequately manage the pressures involved without causing safety hazards. The other choices do not align with the mass flow measurement in this formula, making "C" the accurate representation of air flow in pounds per minute.