The quotient of the air pressure difference across a specimen divided by the volume velocity of airflow through the specimen. The pressure difference and the volume velocity may be either steady or alternating.
- The properties of porous materials that absorb sound are related to the viscous resistance offered to small vibratory movements of air. This property can be assessed by passing a controlled airflow through a sample and measuring the flow resistivity in mks rayls/m.
- Standard Test Method for Airflow Resistance of Acoustical Materials - ASTM C522
See also: Airflow Resistivity, Specific Airflow Resistance.
Subjects: Mechanical Engineering Noise & Vibration Physics