Drone Pilot Practice Exam

What effect does an increase in altitude have on temperature, as indicated by lapse rate?

1. Temperature Increases

2. Temperature Stays the Same

3. Temperature Decreases

4. Temperature Fluctuates

The correct answer is: Temperature Decreases

An increase in altitude generally results in a decrease in temperature, which is consistent with the concept known as the lapse rate. The lapse rate defines how temperature decreases with an increase in elevation in the atmosphere. Specifically, the average lapse rate in the lower atmosphere, or troposphere, is roughly 6.5 degrees Celsius for every kilometer of altitude gained. This phenomenon occurs because, as air rises, it expands due to lower atmospheric pressure and cools, leading to a drop in temperature. Understanding this principle is vital for drone pilots and anyone involved in aviation, as temperature variations with altitude can significantly influence aircraft performance, including lift and engine efficiency. Moreover, such knowledge can help pilots make informed decisions regarding flight paths and altitudes to optimize their operations and ensure safety.