Which term is height above sea level or ground level expressed in units?

Which term is height above sea level or ground level expressed in units?

• A. Altitude
• B. Aero
• C. Air
• D. Airplane

Answer: (A)

Altitude is the vertical distance to a reference level, and it’s measured in units such as feet or meters. In aviation, altitude usually means height above mean sea level, and you can also talk about altitude above ground level when referring to terrain. The key idea is that altitude describes how high something is, expressed with units, rather than describing air or a vehicle. The other terms—aero, air, airplane—refer to air or the aircraft itself, not to a measurement of height.

Altitude is the vertical distance to a reference level, and it’s measured in units such as feet or meters. In aviation, altitude usually means height above mean sea level, and you can also talk about altitude above ground level when referring to terrain. The key idea is that altitude describes how high something is, expressed with units, rather than describing air or a vehicle. The other terms—aero, air, airplane—refer to air or the aircraft itself, not to a measurement of height.