Definition of "air pressure" []

• Atmospheric pressure (noun)

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• "The proboscis is ten centimeters long and uses air pressure to fire a little dart, an organic hypodermic if you will, that's attached to the inner nostril by a thread‑sized length of tendon."
• "The lighted tube leveled off and the airpumps smoothly evened out the mo­mentary imbalance of air pressure so that no ears popped."
• "The reduced air pressure may precipitate postnasal drip in the ink cartridge."