Final answer:
The scientific term for how our brains translate changes in air pressure frequency is the auditory system.
Step-by-step explanation:
The scientific term for how our brains translate changes in air pressure frequency is the auditory system. The auditory system is responsible for converting pressure waves, which are sound waves, into meaningful sounds that we can hear. This process involves the ear acting as a transducer, converting the sound waves into electrical nerve impulses that are then interpreted by the brain.