Which unit is used for velocity in noise measurements?

Which unit is used for velocity in noise measurements?

• A. Miles per hour (mph)
• B. Feet per second (ft/sec)
• C. Meters per second (m/s)
• D. Kilometers per hour (km/h)

Answer: (B)

In noise measurements, velocity often refers to the speed of air around the source or through a path, and in many measurement standards used in field practice the unit chosen is feet per second. This convention reflects common US acoustics and HVAC data conventions, where typical air velocities in noise contexts are conveniently expressed in ft/s, providing a practical scale for reading charts and recording data. While meters per second is the SI unit for velocity, the standard practice for this topic favors ft/sec, which is why it’s the best choice here. If you need a quick conversion, 1 ft/s is 0.3048 m/s. Miles per hour and kilometers per hour describe much larger, everyday speeds and aren’t the typical units used for the finer air velocities involved in noise measurement.

In noise measurements, velocity often refers to the speed of air around the source or through a path, and in many measurement standards used in field practice the unit chosen is feet per second. This convention reflects common US acoustics and HVAC data conventions, where typical air velocities in noise contexts are conveniently expressed in ft/s, providing a practical scale for reading charts and recording data. While meters per second is the SI unit for velocity, the standard practice for this topic favors ft/sec, which is why it’s the best choice here. If you need a quick conversion, 1 ft/s is 0.3048 m/s. Miles per hour and kilometers per hour describe much larger, everyday speeds and aren’t the typical units used for the finer air velocities involved in noise measurement.