Aerospace Physiology 25-07 Practice Test

Temperature generally falls with altitude in the lower atmosphere, and the standard lapse rate used in aviation is a decrease of about 2°C for every 1,000 feet gained. This provides a convenient reference for flight planning and weather interpretation, and it corresponds to roughly 6.5°C per 1,000 meters in metric terms. It’s an average, idealized rate, not a precise rule for every moment or location, since actual lapse rates vary with weather and atmospheric conditions. The other options contradict how temperature typically changes with height (ascending altitude does not cause warming; temperature isn’t perfectly constant with height) and use a rate that doesn’t match the standard reference.