What is the standard lapse rate in the troposphere related to temperature?

• A. 1.5ºC per 1,000 ft
• B. 3.5ºC per 1,000 ft
• C. 6.5ºC per 1,000 ft
• D. 2ºC per 1,000 ft

Answer: (C)

The standard lapse rate in the troposphere is 6.5ºC per 1,000 feet, which reflects the average rate at which temperature decreases with an increase in altitude. This value is an important concept in atmospheric science and aviation meteorology, as it helps pilots and meteorologists understand how temperature changes in the lower atmosphere can affect weather patterns and aircraft performance.

As altitude increases, the atmosphere becomes less dense and the temperature generally drops, which influences various factors, including aircraft engine performance, aircraft lift, and weather conditions that may impact flying. Understanding this lapse rate aids in flight planning and can also help anticipate changes in weather phenomena, as colder air typically holds less moisture than warmer air, impacting cloud formation and precipitation patterns.

This rate is based on the International Standard Atmosphere (ISA), which is a model that provides a consistent reference for temperature, pressure, and density in the atmosphere for aviation and meteorological purposes.