The best replacement for air flow is static pressure.

The best alternatives to air flow are rated as following:
★★★★★  static pressure
★★★★  pipe size
★★★★  pressure drop
★★  air pressure
★★  air flow
★★  speed density
★★  fan speed
★  water flow
★  temperature rise
  airflow
  differential pressure
  duct size

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air flow
static pressure
pipe size