At 3,000 feet MSL, the standard pressure and temperature are 26.92 inHg and 9 C. True or False?

• A. Not true
• B. True
• C. Only true at sea level
• D. True only if humidity is zero

Answer: (B)

In the International Standard Atmosphere, temperature falls with height and pressure decreases with altitude in a predictable way. At 3,000 feet above mean sea level, the standard temperature is about 15°C minus 2°C per 1,000 ft, which equals roughly 9°C. For pressure, starting from the sea-level standard of 29.92 inHg (1013.25 hPa), the ISA provides a relation that accounts for how pressure drops with height. Using h ≈ 914 meters and the standard lapse rate, the calculation gives about 912 hPa, which is close to 26.9 inHg. That aligns with the stated values, so the pair of standard pressure and temperature at 3,000 ft MSL is indeed about 26.92 inHg and 9°C. Humidity isn’t part of the standard atmosphere values, which assume dry air, so humidity doesn’t change this conclusion.