The volumetric flow rate in ducts is expressed in which unit when cross-sectional area is in square meters and velocity is in meters per second?

• A. Cubic meters per second
• B. Liters per minute
• C. Cubic feet per minute
• D. Gallons per minute

Answer: (A)

Volumetric flow rate is found by multiplying the cross-sectional area by the fluid velocity through that area. With the area in square meters and velocity in meters per second, the units multiply to square meters times meters per second, which simplifies to cubic meters per second. That is the natural SI unit for this scenario. The other options are different units or per-minute expressions and would require additional conversions to relate to the given area and velocity.