What is the pressure lapse rate below 14,000 feet?

The correct answer is based on the standard atmospheric model, which states that the pressure decreases with an increase in altitude. Below 14,000 feet, the atmosphere follows a specific pressure lapse rate. Specifically, the standard lapse rate shows that barometric pressure decreases approximately 1 inch for every 1,000 feet of altitude gained. This means that a pilot can expect a reduction in barometric pressure that aligns with this established standard when flying at altitudes below this threshold.

Understanding this rate is crucial for glider pilots as it impacts various aspects of flight planning and performance, including altimeter settings, density altitude calculations, and overall aircraft performance in different weather conditions.

The other options reflect inaccurate lapse rates and do not align with this standard atmospheric behavior. The accurate application of the pressure lapse rate is essential for ensuring safe and effective flight operations in glider flying.