What is the standard dry adiabatic lapse rate, i.e., the rate at which temperature decreases with altitude per 1000 meters?

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Prepare for the United Airlines Flight Simulator Technician Test with this comprehensive guide. Study with multiple-choice questions and detailed explanations to ace your exam and secure your dream career as a flight simulator technician with United Airlines!

Multiple Choice

What is the standard dry adiabatic lapse rate, i.e., the rate at which temperature decreases with altitude per 1000 meters?

Explanation:
The rate tested is how fast a rising, unsaturated air parcel cools when it expands without exchanging heat with its surroundings. For dry air, this adiabatic cooling is about 9.8°C per kilometer of ascent, or 9.8°C per 1,000 meters. This comes from the thermodynamic relation dT/dz ≈ -g/cp, using g ≈ 9.81 m/s² and cp for dry air ≈ 1005 J/(kg·K). So, as you climb 1,000 meters, the parcel’s temperature drops roughly 9.8°C. This value is higher than the standard environmental lapse rate (about 6.5°C/km) and higher than typical moist-adiabatic rates (which are around 5–6°C/km due to latent heat release). The other numbers listed do not match the dry adiabatic mechanism.

The rate tested is how fast a rising, unsaturated air parcel cools when it expands without exchanging heat with its surroundings. For dry air, this adiabatic cooling is about 9.8°C per kilometer of ascent, or 9.8°C per 1,000 meters. This comes from the thermodynamic relation dT/dz ≈ -g/cp, using g ≈ 9.81 m/s² and cp for dry air ≈ 1005 J/(kg·K). So, as you climb 1,000 meters, the parcel’s temperature drops roughly 9.8°C. This value is higher than the standard environmental lapse rate (about 6.5°C/km) and higher than typical moist-adiabatic rates (which are around 5–6°C/km due to latent heat release). The other numbers listed do not match the dry adiabatic mechanism.

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