In the ICAO standard atmosphere, what is the lapse rate of dry air per 1,000 feet?

In the ICAO standard atmosphere, the lapse rate of dry air is defined as the rate at which temperature decreases with an increase in altitude. This standard rate is 2.00°C per 1,000 feet.

While the answer indicated is 1.98°C, which is very close but slightly inaccurate when it comes to standard figures provided in aviation training. The accepted value is rounded to 2.00°C for practical calculations. This slight difference could stem from variations in specific conditions or rounding methods, but for aviation training and the ICAO standard atmosphere, 2.00°C is the figure you should use.

Understanding the lapse rate is crucial for pilots because it affects aircraft performance, altimeter settings, and flight planning. It illustrates how temperature changes with altitude can influence aircraft handling and engine performance. Regular reference to the 2.00°C per 1,000 feet lapse rate ensures that calculations and assessments align with standard practices in international aviation.