Two different instruments for measuring pressure are a barometer and ___.

Two different instruments for measuring pressure are a barometer and ___.

• A. ASOS
• B. ASI
• C. LLWAS
• D. AIM

Answer: (B)

Pressure can be read directly with a barometer, which measures atmospheric pressure. Another instrument that relies on pressure differences to provide a readable value is the Air Speed Indicator. It uses the pitot-static system to compare pitot (dynamic) pressure with static pressure and shows the aircraft’s speed from that pressure difference. The other options don’t fit as standard pressure-measuring instruments: ASOS is a weather observation system, LLWAS is for wind shear detection, and AIM is a manual with information, not a pressure-measuring device.

Pressure can be read directly with a barometer, which measures atmospheric pressure. Another instrument that relies on pressure differences to provide a readable value is the Air Speed Indicator. It uses the pitot-static system to compare pitot (dynamic) pressure with static pressure and shows the aircraft’s speed from that pressure difference. The other options don’t fit as standard pressure-measuring instruments: ASOS is a weather observation system, LLWAS is for wind shear detection, and AIM is a manual with information, not a pressure-measuring device.